Malicious PDF — malware analysis report

Static analysis result for SHA-256 0691b52030fb973c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 21:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57ad07a34751afeeb4a6340414b6ae2c SHA-1: 2411fcad1bff1b838ae9086dbdf2a9116c965c6d SHA-256: 0691b52030fb973ca942218d1d817b5537edc862868afffc67b69cc55d9cc2c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or manipulate search engine results. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adabaskimerkezi.com/upload/file/45970801045.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88510d876---86043539019.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/67752393096.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/65204257980.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/pisififujominovovemak.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1980l3ocpdtnht0qpbebl64pfd/duduralafasukelutek.pdf
    • http://tydafa.com/dafa/uploadfiles/20210703063238.pdf
    • https://worldcastlive.com/userfiles/file/68657163303.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec97743e6d6---dininepusofirapusufekixo.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5db8efad4b2b0f27eb24b937b5c4d2e6/7394193418.pdf
    • http://3sdent.com/upload/files/gejupukivasuzudidoja.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e4bdf0e6---53034644394.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67c45c13d---85579847546.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/7ed273641c1ed592611fb3c62d5133d7/17489068120.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/fawazisuwuxekiru.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c66ca4e3---pujefojasitite.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093acd61e398---17670144847.pdf
    • http://citysuji.com/ckfinder/userfiles/files/fokewodadof.pdf
    • http://ongxoanhdpe.vn/upload/files/wonofelisunu.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/krf0klqt3umfir0glffp0lh6ms/jifemuwunezowutepakisixat.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06f2196544---dumunitabu.pdf
    • http://klinok-saintp.ru/files/68340981981.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6bb3b1c1b---zawufun.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/780afc69633e6b0969845f27bc47953a/8589358491.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clinical+neuropsychology+assessment+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effa.bin
cb67dc4456f59c0c86e1acd7b5d551b23f196a3a14a11cd5d08fe3df31ee288e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16824 bytes
font_01_sfnt_off00011b82.bin
a56aa5cf81b4a7a5880ce4485c55a479706f91651513a7f7a447baf2a6fad597
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 11312 bytes
font_02_sfnt_off000135bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135BD 16792 bytes