Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4a6f324634071b…

MALICIOUS

PDF

84.2 KB Created: 2021-07-22 05:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 436a79ef61c4675be0ee31c169fbbb85 SHA-1: 00c88161b232ba44330e46da0866c5c3b16c16d6 SHA-256: 1d4a6f324634071bdabf2c0f8254f6d63ec33d12ef26e9e085072a3076012c2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://campfirewtx.org/userfiles/file/wokol.pdf
    • https://lapalettedesarts.fr/gestion/file/nugexudoriruke.pdf
    • http://carrozzeriardue.it/userfiles/files/16948151127.pdf
    • http://granite1962.com/clients/869125/File/3099004237.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8952905c---goxenegafalewavezenugili.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3cf93584c15060585605daa5bdd2a341/perujonunimed.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/43c87aae60aed1708b2c64e2770081ad/83208543778.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed05440745c---pimatowixonuli.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08ee8ed25---sapefut.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b208c1ed---bazivogev.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/filisibusuzodaduvurijubi.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gkrono4kdg3mcl48ghbkr6cr66/xopupomivuk.pdf
    • http://alt-1c.ru/userfiles/file/bilemutijomu.pdf
    • https://vipbeachhouse.com/uploads/editor/file/jabevagatatep.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rhb6er8qis14554b4sorjc5792/34584397564.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e4e7c0feabe1e8621a1921da975bde80/93324199334.pdf
    • https://osakadentalcare.com/contents//files/kopilabukitepuvobumefa.pdf
    • https://ms02bet.com/contents//files/3157468458.pdf
    • https://sanidom.pl/img/file/47775591995.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090eece2a253---xekilirizumu.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926c674b7a1---63035769830.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815d09aae47---78710582333.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/v3471ksj6jmsmla0p2hj60ps03/disoweg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=your+love+is+conditional
    • 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_off0000e6bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 16792 bytes
font_01_sfnt_off0000fecf.bin
f8b6f0ea5fbfe175629fae9cef6468a27623a9f9c2515398416c8b3b0b0e93f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 16640 bytes
font_02_sfnt_off00012a12.bin
05e3cb596a342b720c844484fa2895062640e99ac9d6d1a8bbdc36bc4da608bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 10512 bytes