Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f2d48b3fac06d3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 13:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 931c9070caed6174e154faeee35696fe SHA-1: 861f5f0c8642ad68341edbff4b076f56eb01d005 SHA-256: 71f2d48b3fac06d3f623b37b6fbbde91d9ee62073d86bf87042ce222f15e3bba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of multiple external links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=vandam+en+espa%C3%B1ol PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138301608d92---86647283739.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/27018303051.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bcb56de55a3dcda8a1c4929506159461/60542270825.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/someroboxifigupunon.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bewawisaw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161340188d6bb0---70169721694.pdfIn PDF document text
    • http://toroisg.com/public/images/files/83656281968.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/domerufefagaxurubaxabot.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/mudematu.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/supizotef.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/56408763895.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/81065308595.pdfIn PDF document text
    • https://yasacompany.com/upload/files/wuwivakekoragiluter.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef8c01524---44525848826.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/zevere.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/47374929803.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/salopubiw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e38124b---49951881411.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/pemipozepenatulob.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/70535180276.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/gapalu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b19429f52---vuxaxo.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 20092 bytes
SHA-256: 002ad92fe0fbb56cf9064e028ea32285d6f2cc30d281e4ffe286a74b49448b6c
font_01_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 10436 bytes
SHA-256: beb7c1f23e578dc96aef851913b1a52f71a030960754ae0076384dedb7a6ceb3

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