Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2340fa2715636f2…

MALICIOUS

PDF

93.8 KB Created: 2021-07-31 15:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a4f641e6bd4aec06452b6e5b80a759d SHA-1: f49b157c59aa9a1ec6729c9f121f0141150db25c SHA-256: a2340fa2715636f275114cae7db0506f039df4138431d177ce11a32be3c94f19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/zovozigilugenidiwe.pdf In PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0f34ffe87b623a2b483f70e083d57cb9/wevuxerujo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a9cfcca8b7b27c3b776fb848ced5facf/9144976131.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879779f1ade---sujavojuvabo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0411ba0e1---98780857870.pdfIn PDF document text
    • https://baptistfriends.org/media/54861514117.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/lasew.pdfIn PDF document text
    • http://besteva.com/upload/files/xapemakuzamagepuxetuka.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rbttkl7e7cg8ph58i8fm8flf0u/6802585352.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/29908846206.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fac3325a06266a822fa935ac54795065/78516449872.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9a3f941d61e2c37eff92c49d8459b7d3/15227343424.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/72793005536.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ddd182ca---fiteziwuvujoxetoxiv.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/serinovubizatipaxok.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/jomawugajufuwa.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8acaf8fc5c---48372259511.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/43823323.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///9986526010.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/86148092129.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/33482761412.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/efdbee90c3f3e75603c12e28ea3d3597/lasarukinirodemum.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/267210d34020e4187ca5bb3a12a91e1c/53919389508.pdfIn PDF document text
    • https://aksusu.com/upload/files/gosinuwokifiluma.pdfIn PDF document text
    • http://hotechike.com/files/files/xubonuwotawekesinoridujos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=god+does+not+answer+prayers+of+sinnersPDF 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_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 10684 bytes
SHA-256: 345f03dbed4b77045ea47a14fff758e05c80a098db613545926a400572b5decf
font_01_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 17400 bytes
SHA-256: 625e7a705bce940faa4d728be5978322957825d705ef9ed67b864f4fcf0212df