Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d41682f77e226d…

MALICIOUS

PDF

90.8 KB Created: 2021-07-17 23:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 683176a207f3c4905b3399439f371c3c SHA-1: f6be2d95493b6fb5f17d9802d515fb571cb18725 SHA-256: a8d41682f77e226ddcfe7d6e002a6e36a3b0228566112e4fddf3d58abdce2afa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/5cochgn0222pe07aebgr2il71s/92018786019.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdabf3bed0---rawotemosituro.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507043022199308.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb66cdd42---75261418369.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/v3m3s65chkvrglc6omdd1uu81c/jabevuwemazagoweviwiren.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/832312910.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/momofibuxokizesizituzali.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24339ec0a4---71871451380.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb224f5c1---foduburis.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43e6ccede---52136670712.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/nusuwapebalo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b808e88d---20045395673.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/zonesuked.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6d47jk7l5ap2koq02pk0t7o6u2/67165882132.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/94996762999.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/99acb20facb1a36965e6b325778cb1f7/kumokovedexixa.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/balelozitar.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/63529443668.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/90604170452.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4207e926b3f7a42e077879cd9d74afd8/jemita.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/go3cg49gl5krmfhku72nmlkv90/67844609159.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/93978529386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=curly+cailin+productsPDF 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_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 17188 bytes
SHA-256: b479e87be50c7b25e63143456b56985679e1503bf9ee5e80dcc876616d767915
font_01_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10620 bytes
SHA-256: 86a3021612962204652ef7267f9c0afeede18d07ac77bea6deac53a386bdc86c
font_02_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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