Malicious PDF — malware analysis report

Static analysis result for SHA-256 329ba42db7dc4f29…

MALICIOUS

PDF

90.7 KB Created: 2021-07-07 05:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36f5fc18d64711803db6ce0713b743bc SHA-1: 4a5e5f6afd1d90a84b1459037e7af94e93634602 SHA-256: 329ba42db7dc4f29651eb3b02ac6b399b4d33acd0fcf8e8a30297d2eb24b6558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, hosting files on compromised WordPress sites. The embedded URLs, while some are marked benign, are part of a pattern suggesting phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca2a38026---tudujudewajotaperewav.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e657d1777c---sasemugeruvo.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b683e797b63---regekofurepekudego.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1ba64ceb8---51850239648.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a45caff0d---81541592846.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/98117117511.pdf
    • http://taiwanglassgroup.cn/userfiles/file/96357787497.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/18c5b00d84ffb677a2edcb0614804c3a/jakupufirikafadutidusebi.pdf
    • http://bayanairag.com/uploads/userfiles/files/2371252168.pdf
    • http://www.lugashotel.com/data/editorfile/rejijonolasalarox.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ti5v8s9jsunhvnvev1a1fc0he5/49566355253.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9112a0c9---bekidodevewa.pdf
    • http://dakmoto.cz/obrazky/file/nelawadux.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/bavufazosutinixekafubiwid.pdf
    • http://cobansut.com/userfiles/file/301966572.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b107dbc06e---kerubug.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c960dfd6d07---32090015771.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19eba8665---pogeguzugoxibitigu.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47d4bd5cd---meguganolatoximex.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8be6dca3---vimigoxif.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d6cc3a2ab---rinutejo.pdf
    • http://huile-de-nigelle.info/userfiles/file/84282647168.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/17f436222ffe2091b2a260fe179812ea/28138539415.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b8451221---molaxijipanepikexa.pdf
    • http://automsystem.com/UploadFile/file/20210610235543480.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chinweizu+the+west+and+the+rest+of+us
    • 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_off0000ff7a.bin
2683bd930da3a01fad50a836bdd983487a0d23793e4346d780a4c2482014983e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 17440 bytes
font_01_sfnt_off00012c85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
font_02_sfnt_off0001449c.bin
cd39a2b2a55df6ae8df4cb397877b780932f06b7f9699dcd7f7ebf32f188aa71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 10680 bytes

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