Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b84c071dfa4e2a…

MALICIOUS

PDF

92.4 KB Created: 2021-07-07 18:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ddc59d8ab3d0482f66db322242c339c4 SHA-1: 5f1631378b8080468547ebf304ddc58208bc31e2 SHA-256: a6b84c071dfa4e2a69be87f3bcfc207df68fe809ec5c7db62ba1c5be3d399a85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, forming a link farm likely designed to redirect users to phishing pages or download further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459072a685---53395872482.pdf In PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/kajezisoxuwobal.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a3444268---89172066413.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/98812849151.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b86d741c47e---30826108565.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/69241789008.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gipemitetetov.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/25e129e32ae1a06a87e9792aae41ce1d/17773171283.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca05c50c33---63733056425.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/66488882577.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607954a0d921f---49666012291.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2dbb31de5---52134054082.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5adaaf12---nasijigedapugupekuloxisu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9a0cc4da---70902403689.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a42ed1396fd52fd795ff82ee5b12d046/domafomabexiwunuket.pdfIn PDF document text
    • https://khanikango.in/file/90749269963.pdfIn PDF document text
    • https://cecprint.com/images/file/nuzomedigukisa.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/7031169003.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/wemogujigapepafide.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/57303775924.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/bcd2ccb78b3e7bd100afc3d16d659dde/33875530828.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/75200786107.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/72fab89447ec6913d91f4a2dab5a6cda/wabajadagun.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/99493405252.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/fedinaxovuzupevaxilig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=simple+lung+function+testPDF 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_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 16420 bytes
SHA-256: 1522e9bb0d57ed480533c7dbc8af833c47faf6916215f18ad543a91375db1f99
font_01_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 10736 bytes
SHA-256: a328b1dd28133ca94f0367cf6cafe3ebfa032452582b17124577e2bb790f0f38
font_02_sfnt_off00014c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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