Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e3e8d41006d772…

MALICIOUS

PDF

69.7 KB Created: 2021-07-13 20:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58d59bbfa217f077cc94b2c30e2bb3c1 SHA-1: 09a4a9e3db4afdb59c65cd88768fe3a44e681326 SHA-256: 57e3e8d41006d7723ed7b4f026e8a5e33dc883e874c34af9603e91f42851dbb2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely attempts to trick the user into clicking one of the numerous embedded URLs, which are hosted on compromised websites or disposable domains, potentially leading to a phishing page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e17b1048643---24806526564.pdf In PDF document text
    • https://protradingindia.net/userfiles/file/gozapubezuzagalebokevexew.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1a47e0c03da7e4c29f32eab2a098d27d/28415605662.pdfIn PDF document text
    • http://jfe.hk/userfiles/37870617542.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fdd1679fa---kavudumagivufe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4421cffccd4df05649b18231a82f16a5/13979110580.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/eb16c5f43884a8ae5b69a92b028d7c7f/93363247486.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c5cf2ad82---mufom.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a6bde34838e088c6db68a5a397529ed8/dojagoxawutugibulusu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/54088214245.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b15104d90---76690889473.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d77ff957a3e87f4ea5b441ca8498ffe5/91868445533.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/49216363295.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xaxekowosuloxutovi.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1622419132.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4e22139188802f017a6820723e8bf426/badepifodivimoterugenu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/01f7893117422243bef5dddfbc653b13/69463874635.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/diriwexurex.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2a3059c9c0ab90d68e363e97f37a7af7/29794142131.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbad84b816---tamajanurote.pdfIn PDF document text
    • http://robbes.nl/media/files/42263646957.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/88079148455.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f70e69bbc0b88e2d2fdcdc79d56e2bf1/73580416640.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/32568188162.pdfPDF link annotation
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/tikenenovexefarimo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f11b3780---womuzazoponoxisabageramu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=evaluate+integral+by+changing+to+polar+coordinatesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47D 14220 bytes
SHA-256: 586f39281fd8c080ea0f06b9592fada58566926ac1cbb7c3c16e43a6800f16d7
font_01_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 11196 bytes
SHA-256: ae61b360fbecfacd5e79d33b7ca6c9c02834977b42da07dcebdcb40dd4f05807