Malicious PDF — malware analysis report

Static analysis result for SHA-256 657e364e30afc2a6…

MALICIOUS

PDF

99.6 KB Created: 2021-08-26 12:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27e174047e5e34e538ed48c30fb5cf25 SHA-1: 801a07e0c069334c9371e5120723e3914c96edd3 SHA-256: 657e364e30afc2a65b913ce6703ff1a48be3d76befda2571805270dd14dec114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. While no scripts were explicitly extracted, the structure and heuristic firings suggest the document's primary purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://aihyang.com/userfiles/file/88769769709.pdf In PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/fbu8bas8hhfr60miqo7vb8m4s1/43790658706.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f736a65d500---16910731332.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609428a09b67b---8206450187.pdfIn PDF document text
    • https://mahae.hu/files/files/belisefemokupalonarodixo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0503bed58---lujigexinonojefo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ebe52aff---zidevisudoloxalobak.pdfIn PDF document text
    • https://medtek.vn/storage/file/jesisula.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/vefidopiwazeladixi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fe6e1454---pevixakuzekunovelijabiz.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079799c02af5---37984094059.pdfIn PDF document text
    • https://medtek.vn/storage/file/fifeg.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/c1a8bd27d4074a2c84e77e471c6ad96a/75099720200.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/diziserasagekatonutan.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/zokaz.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fc950ccc5b3ba8a7c13dc3537bfe1a90/ziduxovage.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/40592689312.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/11637989651.pdfIn PDF document text
    • https://jotelek.hu/files/file/pijaref.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/55270873541.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zimulutar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bed81677---2448448739.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd612c1707---doferanofizozerigena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=formula+for+rc+circuitPDF 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_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 10168 bytes
SHA-256: f8ea7844fd79100139a7010f1f97fdd8f29190b305e04eb03a1c445e7e13335e
font_01_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 19196 bytes
SHA-256: e543aaa865c86262ac9f68e517a8e1b103b8784b383da6c879f6703a3c3c9a89
font_03_sfnt_off00016b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B33 16180 bytes
SHA-256: 488f32f6c7fd30bfdfe8985f543ad5a6747cc968f356b2ebbbb561db09c637af

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