Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc7c92be3346ee8…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 00:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 08b58d8dc29e4d5c818030d814d96a71 SHA-1: 114e7e6d2487124a2e3e556b3ae8abe30f88dfcf SHA-256: 3fc7c92be3346ee8034da638e2f9cfd2f82ddddd0f551c4dc43137868b171cfa
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, likely serving as a distribution point for further malicious content. The PDF itself appears to be a lure, with the primary malicious activity occurring when users click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f612e3e22e238fc4eea988d687f5d0d8/bakojixabidomi.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/62736453089.pdfIn PDF document text
    • http://93564497.com/userfiles/84705517968.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/96383744790.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090563852691---53973579660.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/88d3423b3f4f78c6789f2080980e7feb/gebudiro.pdfIn PDF document text
    • https://efnnma.org/files/file/desezanisoj.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfda40b86d---79368175143.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/wupezonofotinurami.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072afc358e69---36873288301.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/66iaoa1tsehaorv4c51vni9jn7/dexazi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e12ebce5---46003857160.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf7ce307e---tonedeve.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/vafage.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/60060693150.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42e89bb27---40323718069.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/xatenanikude.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fd0a338f---65101333850.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bba93e06---30822507776.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/vakibusejus.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fo76ni6ngfe3l2s2l7m13i2f0e/1240675046.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e10e1e5b907b05f6524865204a05d00a/mulosatumexuguxo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/8879444443.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/89l0v8rm4v29erpt2p3ajki081/81446795777.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/lezufaxozes.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984824aee3b---vijavironafolipawenuwusa.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/50141158301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pastoral+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 10552 bytes
SHA-256: 27f19f6cd5195b1c30df4ae663732f686c072617292f2c5f62a5993eedf655e2
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 2808 bytes
SHA-256: f3327e77b170a4c5cb013536f72b234687e5c0ee42625c74ab2164590dfbd05f
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 17448 bytes
SHA-256: fe19d215faeb80fbd28b179428acc38e012d336f07cbc116747956c7b70d5ee6

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