Malicious PDF — malware analysis report

Static analysis result for SHA-256 36118dd32060476f…

MALICIOUS

PDF

94.4 KB Created: 2021-08-24 16:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9820f4a706994d84e821a3f15433f29f SHA-1: 3e061614bd4bb47741d495950da3a570cec1a59d SHA-256: 36118dd32060476ffb98478fd69d0c609fd170247c283db1f6e2ca6251286a85
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple indicators of malicious intent, including being flagged by a machine learning classifier and ClamAV as a phishing trojan. The document body, though obfuscated, contains heuristics indicating it's a link farm and attempts to lure users into revealing recovery secrets or private keys. The presence of numerous unknown URLs, some hosted on compromised CMS uploads, further supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://talleresjpg.es/img/file/33089737105.pdf In PDF document text
    • https://digireg.cn/upload/rubosiduruzewipe.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/16992311290.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a9754870210f0433e6299244ddd7171/10267196067.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/poziguki.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111a056ced73---1149762110.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/numowumadobivagen.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/22135013898.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/93iti29q81291jaquaneig8117/93835492868.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/tugedekesisexexaneg.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e3fc0f0e6ff91b5d2d38e50ee51499e1/74529288428.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/mexivodenife.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/wakinifojufi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ad08bed0---nugisorafalovozemasaro.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fe117f59d977a6264f6e0da0ad1991b6/pojexevikiviba.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160705a66a00e6---nimuxovenomixis.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2198d792e25585ba1b62e76362f97ca9/natejubemuxo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec55688d6---suzadoposibisenomurudid.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/fec205ae15a0760803eb8bdbdc0377c3/xejawujuputapemuwazan.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/55580551575.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ee4b0f4f---kifesuseferaxakitavifazep.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edf80422586---13490237199.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/24026cf76f73ef024e1c8731999928ab/90324039334.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/sewegetu.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/noguzimupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=afcat+the+first+step+pdf+free+downloadPDF 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_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 16656 bytes
SHA-256: b392e7bb213a8cb525f69104405029bb618ca2a965da3c6cbf663aeb5fe3a95c
font_02_sfnt_off000152ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 10784 bytes
SHA-256: 71dbde5c01729fc3eae82b7f319e6a3d5d001c133d7029eb9ce670b2bbd5eef8

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