Malicious PDF — malware analysis report

Static analysis result for SHA-256 301a2c2745b4b5aa…

MALICIOUS

PDF

101.5 KB Created: 2021-08-14 23:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 99d59998e143e9b23166e40da79b6a72 SHA-1: 3b39f58f9ca138b97ade2466e958838c8a7d1a46 SHA-256: 301a2c2745b4b5aa53b87f2aa58486c6221d6e70cde80bad03b12d884e50ab9a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://naturabliskociebie.pl/userfiles/file/mapajigejuvevezob.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/80604844891.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e7120ff17d60b57791469fee5d55d600/57720898082.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9e3328dae2d6d75389a4e114af046816/61436948174.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089199ca48d7---35782607365.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b794a55fe90---7563921148.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9837240d56b48b0565127f96678976d2/4304011468.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082079f1a143---15043719333.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a6de14863ed0b38b4b4faba04af2c337/18216719735.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/59405623342.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084e698da1cc---lijinajataxedexijuba.pdfIn PDF document text
    • http://bulmarconsult.com/files/93644440970.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/latofazowowefujibuvavi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813e6585223---49059248786.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/jejubapodiko.pdfIn PDF document text
    • https://5uempat.com/contents//files/67545833628.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161115cabc106b---rufogu.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/teburugedanuzaxu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee147fa2a82---rebopuvixuke.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/sakajuzaxazomoweno.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2f197fa7---xasotu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec47d837fa---fedezuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=super+smash+flash+2+unblocked+game+centerPDF 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_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 11504 bytes
SHA-256: 7550278ecdb93058bef2a9b919a7bef2874b6993cb6856e0aa89f272572179d9
font_01_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 1932 bytes
SHA-256: 78b0a163e4eaea4fd1c276a6e09b3ffe8714eb7cdf5cd8e6d31ca7f4d18684d2
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001565d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565D 19224 bytes
SHA-256: a9c28632944df4b2d724a9c332cd681cd76341388f3f736cf41bbb36050525a9

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