Malicious PDF — malware analysis report

Static analysis result for SHA-256 104496672d1bbd5f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 04:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 808045d7958d65471c864c71b2fb8bc0 SHA-1: c949eb442978e8496d01cd7502cb2c2f2bf7fe0b SHA-256: 104496672d1bbd5ff0453a6647f32673f4ebe490c8960b9a3e7ae1759113bec0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a direct analysis of its content, but the heuristics strongly suggest a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://sport-way.ru/img/file/82944779049.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n0lt1ofejvdp3duddqieu7gih4/46321730552.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3grabjmusg40gqdl5ufjbdempb/temovudorotaxegabo.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/42882358776.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/30b4955cc2dd200d4b187fe33b0545fa/84796621611.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/eb6c31c67a7a544232319937b3268c76/lanozarijaso.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/97eebdc2652e41a3b33fc21357b7a2ac/84063697476.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/46360210073.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ceb3c8c0d97e26d58dae0eaca723e96e/sewuxadopawimofaletejin.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092279b17b17---vepiwefa.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/88470170603.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/gefapemo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450fcb6d9a---57508849785.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2d56aa37731c50978f7d83b40b0d421e/pizunitemalezaza.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/rezulugoderetexenoni.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zezulajadofamasa.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/90967281224.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/sh5hcr5fp27n48reu2otc9o752/lubewevezolotikirawa.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/zepijakikar.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea642c94cff664e63a9bb13c40d60f79/pubetexudaxadifolififozo.pdfIn PDF document text
    • https://partnermind.cz/images/files/deduzejupuxuximek.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/087f07a39b15ed074844cad40b187b23/tedub.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/l32cadtk7054celhpk5jhljaru/sefow.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/29301837555.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/29193306081.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0dbc6893cbe74c598e9c47ee41463e95/73869443284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reinventing+you+dorie+clark+pdf+free+downloadPDF link annotation
    • http://irodori.kir.jp/files/file/94665299592.pdfIn PDF document text
    • 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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 11128 bytes
SHA-256: d9b678baecae9bb82fda252b6796c487f108dad227ca4f31c301a5ae2860c1d5
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 18644 bytes
SHA-256: 15779f75c58b6622f416088a8397f30d6c911bb2345621b1148519bf3357cece

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