Malicious PDF — malware analysis report

Static analysis result for SHA-256 845d1ec7285b7f60…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c18d4859b908596fee046adfc648847 SHA-1: 31b3bc968af567a7ed005cac36363f89b85dd210 SHA-256: 845d1ec7285b7f6069ae5f60f8eb1f256871e378a5b7d775b319def0b3285150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress installations or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, but the structure and URL patterns are consistent with phishing or SEO-based malicious distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/41ebba12bd35db8bf8e530f86d041a0e/41501786985.pdf In PDF document text
    • http://france-ex.com/images/blog//file/94113799472.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c80c1a3142---jafagopo.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/durop.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/bozarikavonevalipetative.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kopitisotowiwo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b243e0a9e57---70959258062.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/3509858698.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/43462673888.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95e6a449f---50502979889.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e4439557a---fizadedasax.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/58058537102.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/xorexogama.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gm9nh2fab9pf0hhsu947lebhmm/5585386362.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/mojajefiburew.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/pevabajugaranuxozipubo.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/67051ff95d85010e11b8201165c36c73/93876888592.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f3c3f490c863726f9b0959ff26cdb4d7/65422410730.pdfIn PDF document text
    • https://fallsplat.se/file/vuvogutuvaboxaw.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/wipukiwi.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430863849c---7399699828.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ebe9aluvp38h9dqbqpr3qtcko0/82686416102.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160713020360a6---fovodavofigodiza.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/28115324846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=enciclopedia+botanica+pdfPDF 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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 18132 bytes
SHA-256: 4e5b2cbd043fdc6cff1c669b0a66399aae1ef5878d3241b28dec5352a8a65f95
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 10468 bytes
SHA-256: 25064b5ec89053e40bcda19c02fa8adaae7212ddcc44e671befa9ad276d164d2
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1