Malicious PDF — malware analysis report

Static analysis result for SHA-256 de01c7086620a1f0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 04:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f6a983a6f290545e0a62f83f6f7cf3e SHA-1: 5411f3b1cdd013dc4c70868414fcfd5c51177bd3 SHA-256: de01c7086620a1f0e9f890681c64a623c8c8b9c986a0387a630702ea7818bc93
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://entone.es/wp-content/plugins/super-forms/uploads/php/files/20c248520ea9e2c0e0a869fc4e967696/98154632098.pdf In PDF document text
    • http://varosom.hu/userfiles/files/moriwikelu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ccbcc6387ea21c1670784e04638b9464/lamukezexu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/57912942359.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/4049998572.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/meluwo.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc82890ce---wonafoledadajewoxabenede.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9oc05k9h9t4qnsdlvfoman8etr/31444404609.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6710683e---78991947201.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/29986074148.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/molefanetugigedesiguxutaj.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a8ea9d91---juxinife.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/lijobebuteb.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/25209044455.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fitilitazaravekewofaduf.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd956eadd1---88217730810.pdfIn PDF document text
    • http://altinay-law.com/images/file/velojakumavewutipero.pdfIn PDF document text
    • http://premium-h.info/files/files/diranevusaduwasiguzuraga.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7b0b681fdeea0df21cf687a6b417bf20/sadanupovude.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bc7t037q5k6i3rmo9u4lpjv09m/marovagusexemi.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0c1d0f9b---kopevonebabofadobidog.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tokubogimitapoxi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e85d8d5a4e4a0f909621c4cb880c3e44/47484308465.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_075325_101.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/jofof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=colour+idioms+worksheet+with+answersPDF 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_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 19032 bytes
SHA-256: 733a845ac5da495b45cec6196a57268235a2514ce181344647e44da5804ad3e7
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10824 bytes
SHA-256: 845052ae072b06c93f14732f752459cbc54d6727a563e064c1dbb2f659a49fdb

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