Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fdc73740f49632…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 05:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de264db4f5d9111e01629ab282d02948 SHA-1: 5609faeeac1fd86808d23231e45ec391800dcd07 SHA-256: b3fdc73740f49632057c6fc4eb4b99d25dc2bd986d91980a950385b227b504b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elvirajogsi.hu/ckfinder/userfiles/files/32275068257.pdf In PDF document text
    • http://pure-chiral.com/upload/files/60213739856.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e977b154b---84709451199.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/31201689518.pdfIn PDF document text
    • http://eternoohydro.com/d/files/puwokon.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gavuwotimejiwanis.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/8104782333.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/puwiwuborude.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbf0a81a3---67915739010.pdfIn PDF document text
    • http://devveb.net/userfiles/file/sokujogurowoba.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/45563359561.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fa3hn27ofdt58qlleajfecitce/41189849028.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/26486833030.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/raxasunobalol.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/loverepev.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/kakefewim.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210831233823.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/187739756.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/mevefolidod.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7627e09e7---40114945588.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/refuwujuwapelebameb.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/43060621938.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161318fe5a0a82---mamulonurirup.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef5c64e75---kifibesakigitide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+my+hero+academia+moviePDF 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_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 10488 bytes
SHA-256: 42e618d5a3ad4c494e4d49baf03a37f2a6880d45163e391d2f98225c739a1d9b
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 17596 bytes
SHA-256: f78b9d808bf8bd593a70828c51fb92791b4ee96cd91a90585f79cc19497e245c

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