Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1aa85cd60b6992…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 22:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b104bde009361c2c1c4d5c09016f40f7 SHA-1: 5860eacc60137fb727ab93aa7ae3196e28596c1f SHA-256: 3a1aa85cd60b69922caa22d762910f16d1a53de18c6c191f3c6152acb0a704f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing an embedded JavaScript stream and numerous external URIs. Several heuristics indicate a link farm hosted on compromised CMS uploads and disposable domains, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f2d4d46d9d0867ccc6a2dbf496567207/kevobe.pdf In PDF document text
    • https://faresaldabbous.com/uploads/files/87031736057.pdfIn PDF document text
    • http://mamitobe.ru/files/file/jijefajifamar.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vubezipozoxabodoxuduz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc88c70fd9---jilopesoxuvivositewobit.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/5881956655.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/96219036928.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/21658296741.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/15383427090.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/76918666997.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e5688527---18689213043.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/kowerodupudabikik.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/47995996852.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/92106421980.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/47584868730.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/waputelizuluvazejezadigow.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/godimemanesukozesojuzawed.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/61d471a146af5ed77a7679ab6dfa8dc9/27278960400.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/39769887982.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609898a926c53---98639369806.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/41875609062.pdfIn PDF document text
    • https://bfull.ru/uploads/files/wuzonavik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+age+of+sustainable+development+jeffrey+sachs+pdf+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_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 18004 bytes
SHA-256: 45d0a1b9444d4fb54041b2f6fcb360c011f0ad77db5168e4e8f1112828f99565
font_02_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 11664 bytes
SHA-256: c74ec4a9c2c005619541c32d2c942c4a44468f8e0b3f0aba5bd67f7167f46c1b

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