Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74b9e9cfd9a65fc…

MALICIOUS

PDF

89.2 KB Created: 2021-08-18 00:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d3321266c8b37e72a37ddc8f185df61 SHA-1: 6ca6e42a775c119e4d1429a0a09b10eb8b7493e0 SHA-256: a74b9e9cfd9a65fc04ea00238932fd7bf3d3d641ae1b81a7fa00ce1b28f28dda
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/33302899098.pdf In PDF document text
    • http://sbstroy53.ru/img/files/zabexugevijovumusuni.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021072705515273499.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b7v4l0hi2ol4dnn32aj7264kd7/natuzuwupiwedojopani.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/80543657380.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/sopatuvuvonogagutimev.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rewutezo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608255bb37e9f---muguvubi.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/kisoxowefipubozuxasu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e366adf72f---56606982017.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/24905906941.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/be3c268c6fb2972412f8fed87ccaba00/15491490198.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/oggful7knipd35bf9lrtab21ab/jizoruku.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/guvetomijanomixose.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/48792847338.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/21601100317.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/71842806611.pdfIn PDF document text
    • http://indecomavo.pl/inc/dodujoniwerifolize.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/diwenivevaw.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e1945d55---lubimi.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4b4f1179375c48c8585cb7e0a256e0ef/gugurixufutet.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pikolulirimidodetanosepu.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/wilubemejotaresil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ver+novela+de+rafael+orozco+el+idolo+capitulo+47PDF 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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 18168 bytes
SHA-256: 3ab74a45a69d40aa36e714b26efb4e84cadcfe38868c1bb78d68f3b4ed23840a
font_02_sfnt_off00013c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0B 10768 bytes
SHA-256: 1e1835e1acf0eea9642198e2bedb543f0580281694ed4a8a0010d1dad605c2d9

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