Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a408e737ab5c52…

MALICIOUS

PDF

96.8 KB Created: 2021-07-05 15:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe11199d0230e237af18960c9762d953 SHA-1: 97f164cf9f10cabca479b656fccecb5ab48e1ef1 SHA-256: d2a408e737ab5c52656063ed0d604c7849e23129fa5112c8012f862de83f017f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The embedded URLs are the primary indicators of compromise, likely serving as lures for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a17aa3397---86392822477.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b82d5111---68665522210.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/68517646950.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kepelozujinawa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fojatepabimixolapoxim.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c58f23716850ff05e840879536a26cc1/zigafasabutonudupikizu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c39ff681055c51e7e4b321fa34f8a519/merujapofuxire.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gekjjj7b4b5a1f0kcebmbk112o/tizebiravofotugejaremiruv.pdfIn PDF document text
    • http://sport-way.ru/img/file/57278742659.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077919869024---59379251349.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/7660416126.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3abc55600b---wikatafajekexetavopekeze.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gared.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/golexeduniwebelosoxafopan.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/44337357587.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee911719b---dureluvunevusimovefen.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/42961628348.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086716340b52---84516622865.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/fovafagilajaxasepobal.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccf6d558f---nogiziran.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/92609779671.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83e5b61d2---58493685308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=to+be+in+dire+straits+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
stream_003_off0000f8fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF8FB 29464 bytes
SHA-256: c599f7c2a97288e2ce4965ae65d5e371860da29d29278409d2d2117e6624b7c5
font_00_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10648 bytes
SHA-256: bedce42ca00268136859c2a144db307c3c575f53133b8befe16269337ef8bd3d
font_02_sfnt_off00012d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 17532 bytes
SHA-256: b0882f957fbe3dca98a7de7854bebf2dbd0dc73faf114d1c9add08d2e2a3a0a4
font_03_sfnt_off00015b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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