Malicious PDF — malware analysis report

Static analysis result for SHA-256 979522db2491893d…

MALICIOUS

PDF

107.4 KB Created: 2021-07-18 19:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ea132cc8ef33db970041739a94253be SHA-1: dd3c44153f928d68634936c99bcc280b1a9b16b5 SHA-256: 979522db2491893d32640dfc17d070f7b447eed59834cb42e54c02e5a6ab07e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7d10435da1cd6234133a084222b9acde/kafafapojonava.pdf In PDF document text
    • http://rallyteamwalraven.nl/file/jarub.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/86244974460.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/701276720fa5270b7e34045e7a5e99c9/tipipotobu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/55642799234.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/49cn2sut74ivmjfo22u0nqifj1/vebisinibixiperabug.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56bea23f1---40242715956.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ab4f5849e2e836e445624cf5437bb04d/jarasatujirel.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/76760466016.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9ip4l2cm4e2us6aib9au0tvrl1/teliva.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/27962518474.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35eada584e---vogatelule.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rulivozupu.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/jujusuli.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nsci54p0934o4v8ulnmvp5e4ps/wodemilepijuzevom.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f512c2a93281926d07043774dfd27211/lujebakumejigefo.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/97576071480.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/sojena.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5746733a7eb273a53182b4797a7f0492/37724533857.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/bibewonotesemisufowif.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135f4be9a1---14564076310.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba865f0e7b2---liligijisejediwamadu.pdfIn PDF document text
    • https://noddy.nu/images/file/xakajudasilel.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fc14f853e0e993f94d4398a8cbc77a74/kuxozenepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=arma+virumque+cano+meaningPDF 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_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 7540 bytes
SHA-256: a4f4ccede1d26718c0462b2ce4c6100c0453f8b6d14c03be9c616bc0a2a7b9f2
font_01_sfnt_off00013c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C23 21272 bytes
SHA-256: 2be6ddbc0b42e166063316d418d4c9cedaf6ce13ce6bedf3fb7478bd01757b00
font_02_sfnt_off000170c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C4 10552 bytes
SHA-256: 5510a6902dcf4e0e8f217faa7cf923e30a76348e29e68678f2143038f2b56ed5
font_03_sfnt_off00018885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1