Malicious PDF — malware analysis report

Static analysis result for SHA-256 616484692e1d5d79…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 15:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75e7b14455f16c549db798db56d85ed7 SHA-1: b400e3a6734ffb3d2795514ac286d72b5d4eab6e SHA-256: 616484692e1d5d79b9f5f44efb37a3449498aa50be0c4e6d9659afd60dfb3a19
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945169ceb3a---mowigorepisudulipebovip.pdf
    • http://www.findvoters.com/userfiles/file/taponozedamaxixidoramevu.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1b69cc33---gugalijuk.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ed89b617eee077c2eacd0003f6c4b9b9/kukijevuvoti.pdf
    • https://iword.de/userfiles/file/82200853807.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b01fbeb32---gavifuseripelivejuvabibu.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34f06c6fd---81382021827.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c6756b407da---10592184311.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b1a4be0e127a3b98cbc995d0726bd813/64889850554.pdf
    • https://scanclean.bg/upload/ckfinder/files/misopeferakusarom.pdf
    • http://marta-galan.com/files/varios/file/jamebakafinokabavoxasifim.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6567ac6bb052fa07544b3c4936bceac6/39630114307.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b2277c2e---rasuxojebirotidogop.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc28589626---gugamoxufowafowotako.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4c3f5998af71465a4c8da81e4b33d14c/56057894803.pdf
    • http://e-hane.com/files/javivejulibokagazuwo.pdf
    • https://classconnbio.com/img-jacson/files/52601698259.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f260950a0---tapekaposu.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/281851b38d84922a4f52ea4103498d83/77923473997.pdf
    • http://kibbkw.com/uploads/file/dodap.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/835eaa1f81596b6f3ab5f57a4608b405/wesoduxenixuworitipag.pdf
    • https://landi-bg.com/images/file/9204084318.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b05b256ecf4fa1650d2a527d50080d56/wogixoj.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wewukutepelupedo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+help+someone+who+is+depressed+over+text
    • 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_off0000e9a0.bin
bacabc0de87ade93eb5ef939307ccc7ff3f921c26b6e7180f67d2f0b1c02ffc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 17932 bytes
font_01_sfnt_off0001184a.bin
7b70cf4cba1e6fe341eb10fcc79f639d59d5e81a69a4777fe1725b7d4881182f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 10740 bytes
font_02_sfnt_off000130c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 16792 bytes