Malicious PDF — malware analysis report

Static analysis result for SHA-256 797cf4fb5271a466…

MALICIOUS

PDF

84.5 KB Created: 2021-08-06 17:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef6f87473d763f5bf973a21eefdcf51d SHA-1: 56222d304dbb8512a9c3a27b4cb32a05cd042cea SHA-256: 797cf4fb5271a4663e6cdf0b15f24e71e22b70112f64779d090e52a17370cba1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on WordPress upload storage. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://aucoindeshalles.com/menu/file/65005041218.pdf In PDF document text
    • https://etadelloro.it/images/file/fubidujiligovuminotel.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/takilefajomufupe.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/56707731691.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a8f418a425056daf95eb7079104d63e9/16494083259.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a33338c001b72931a572f0430d2e37a8/55669235435.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/49561b7be70dbd8d9ff2b02bb80d8cde/rukib.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/64115305183.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3e26bd85---44835279125.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/zutajuwozojer.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/telefisapaxovab.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ba9cebf6---zobaduvav.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdfIn PDF document text
    • http://dzbnf.com/upload/file///13319392713.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/44359511925.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/29645444903.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210707153020.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/el08jmv3ng6qv2dg1cjmfhruv6/32697567147.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pafedexeluvor.pdfIn PDF document text
    • http://nakatka.com/files/file/ragexagidetibowikekodorod.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/nalefomejisasiwagilumux.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af8f53e5939---94537212437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+long+to+get+letters+of+administration+ukPDF 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_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 10964 bytes
SHA-256: de8e90c08fb357ce37cd2ce853a6572e898f93e6e57ef55c44cd0d44c48ad46e
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 16508 bytes
SHA-256: 07c489acf0aca21f678549497bd51ec9f1ece61a7fad98fa1ca61853603af1c6
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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