Malicious PDF — malware analysis report

Static analysis result for SHA-256 8705b0b8bd1f5b12…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 00:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae4676718b92780f26d24715edf28b0f SHA-1: 36339598ce6fdb9fa1692ec05775580c4283c0f0 SHA-256: 8705b0b8bd1f5b1232f0ec572c0cb54722337974b980dc176c506ea0edde6dc0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The document body is heavily obfuscated and unreadable, but the presence of multiple external links and the 'PDF_IMAGE_LURE' heuristic indicate a likely attempt to trick users into clicking through to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://medvor.ru/uplcv?utm_term=pokemon+medallion+battle+apk+download+for+android
    • http://4998horo.gmmwireless.com/contents/files/jefufitozinipirulidusobo.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/8307590518.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210919111004.pdf
    • http://tahokart.ru/userfiles/file/sevunif.pdf
    • http://ping-property.com/user_img/files/potewonofebikuxil.pdf
    • https://namhunglogistic.vn/site/files/memofiwa.pdf
    • http://bassonconsulting.mc/userfiles/file/79466754690.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/99b28bff4e1033268345878308030b02/83722944801.pdf
    • http://erainbowrealty.com/userfiles/file/78185197143.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f25519dc394f2a98113f80465bc4724f/zitiletil.pdf
    • http://erainbowrealty.com/userfiles/file/sekenabimekasakivutidowa.pdf
    • http://sun-green.be/ckfinder/userfiles/files/13752977805.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac8895c98---bagenipeviwuxajiwida.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210902_873823F9416A48C2.pdf
    • http://njxinbell.com/upload/files/bufavagifulusanurovusuti.pdf
    • https://landi-bg.com/images/file/lafalelo.pdf
    • http://uni-soar.com/userfiles/file/96791694389.pdf
    • http://bbfrontedelmare.com/userfiles/files/69046711299.pdf
    • http://olynskiconstruction.com/pics/file/saneredesozobavesovawu.pdf
    • http://megaprestige.ru/uploads/files/verujek.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/keliforasidolixuwud.pdf
    • http://theponghop.com/upload/files/2435156629.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/rowulugemebipapetasox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0db.bin
8e4e26ef178c3c7a844b979772ec91bbcc7932f298003a889b98a5a634ace3d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 14280 bytes
font_01_sfnt_off0000d430.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 16792 bytes
font_02_sfnt_off0000ec47.bin
ec611e04783a79d55bb2874614efeb6e1d54c5c659ad883d7886323ec941ebd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 10812 bytes