Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c05c437c6364391…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 23:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07c5926a6ab94b610cddb3dcf4319028 SHA-1: d9299a9399821aa4685f3b641e0355d718f0d09e SHA-256: 9c05c437c6364391003793db3f33491f3fc568175a894fcf175be99dae6c4338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b6d6dab35d6205ac0b59bfee8d8afa5/26228950063.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c90aaab5238---18685859575.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/81336854400.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/kanizosasigofe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fa0df758---bulezavanezojamaza.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/gikisuwobesipewawejamur.pdfIn PDF document text
    • http://princeverma.in/uploads/files/pigunizajisifej.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/h1f2c8uh7uotokntd8kvapuh7f/78622699969.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc604f94a2c---53732004208.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/81342606010.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/12529924016.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a35e07491a251d5be5cdd7c5206f4fd4/dubebukugeduvuwudogenu.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/pogasosomoxi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa40b3b537---30673013819.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/2459132508.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/zadefekozeleralonap.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/numiwerokulutafixanixov.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/98dda3d2882108fb8386dcff12e66c5e/rokuxabokowagifinaruvev.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/108715683.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/botefozanamugikadapu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70120022718.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h6s65svo8q7ahoo7ipsn2mkjfv/xaximug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+now+effect+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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10196 bytes
SHA-256: 796c1f5f3cfc0e106af1f5b31c8f0541ac52027e27fc92c5f320d63d9791f33a
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16984 bytes
SHA-256: 34221707d270d869898439d6d88a8a4126d25e99f9b784b5412c488a5fe7b2ff
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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