Malicious PDF — malware analysis report

Static analysis result for SHA-256 37feabd4169bad60…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 22:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59175617b0a8136425382684bded66e0 SHA-1: e86fc2678602d22da9291331ba7510a6495b8765 SHA-256: 37feabd4169bad601eb087755d2b9e47cf8e85760d0e4fe40ea80a18dc5de840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=breville+juicer+recipes+pdf PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4fa2d4fe5fa840420157f763ca480a96/kareramibotelumufelafakol.pdfIn PDF document text
    • https://retta-bg.com/userfiles/87609212219.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/01f2f594b0e323e444aee343336610ac/dikedavevag.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6379668f4---sisawe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c0751def---muzexesugibisokolapem.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/8222273384.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/rofuxuvipopekibiserasure.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/selaxuze.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/gurukozoketaxabojani.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/55670644505.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6vilt10d46leiqnonmqot2ohmv/nelewadesazi.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/95202516055.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/buwazumodexikagedop.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/bapanudinoleguze.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/651bcc37e8b15c753723e767c37420bd/demobiganitefime.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/darurafilatutolatididire.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b9a9de08e---99846620197.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2def34d37a2e115131dc2a23655f0d31/kugogepoxisojoka.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec2ea8a5d---35549325956.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a95a935d---tedosaxifogujar.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofefaxukaverikad.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9faf63010---33557159612.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/fozevolisuxudaduv.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/velekarakigotumebeka.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezemonenutadu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/iqjkotlj8utis6bq5hqp1vmpip/vevepalosasi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/bjgbr4tmnglttv7sqvph9do7ge/kipeliginidanepamenesawi.pdfIn PDF document text
    • 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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 17196 bytes
SHA-256: 8850e6d53893e280bf935eebd8e137ad22ae83c8d672be52581bce73d8169f90
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 10476 bytes
SHA-256: c3a3070a2f613242983addff3ab90bac995bdc5cf7f3e7a20f4e6a04aca4e16a
font_02_sfnt_off0001295c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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