Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a36436e4aa28ad…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 07:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0767008520acbde371acca867af2e8e SHA-1: 4376ad3d64ab33a6ede78e5b0621624ca09b20de SHA-256: 70a36436e4aa28ade909ea18e374cbb90d5cebabebe5cf592fff21effb56889c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://dush-kz.ru/uploads/fck/file/matevozoxetutibu.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c73298ad4f9---80026168835.pdfIn PDF document text
    • http://isvpro.com/custom/files/zoxirotejesud.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/wasereto.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/sasurikolopadusolutomo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/46eca4b8bf69427ebb1cec615fa6a53d/34992421968.pdfIn PDF document text
    • http://grabnerestriche.at/37792522361.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/risukowegowojavo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608517e811b16---rukixira.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/tolepuzoma.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d024b33c4f---gosutojagi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cb945fefd8528919a97b9837fad02321/72326657859.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/zudojanipofiradib.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jadalawewikabadoz.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/lawarozikekonugu.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/bavivuretolubuso.pdfIn PDF document text
    • http://aldercrest.com/files/39081271873.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcdae9174e---kogilob.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bbe83fb53---68787081912.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/62061099421.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/bezonosavizivunujisin.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/2076883491.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160772217625d6---wufuxotilavopew.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9e7a8936e0d8e60dc4a99a8c5ded6b28/83559270134.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15dc65762---26345063192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+indent+the+second+linePDF 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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 10496 bytes
SHA-256: 184029241a292c9f3a221123a7505c75485dc20ce8f38ff067962e1d518fb9fc
font_01_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 18016 bytes
SHA-256: 0a8251151a74d6be1d58fbcde2fc7b825597a2fa241399812199dbc8b776ae7c

Open this report in the interactive analyzer, or submit your own file for analysis.