Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f79d435252285b3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 16:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98ab101d5789a93d9869335297ceceeb SHA-1: 359b7450b50489ef94443e951a9ea71d975e88e8 SHA-256: 1f79d435252285b31b81d51c43e2f03d73b7b66019a0cee59a35501c82dce6bf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aventura-agence.lu/userfiles/files/mukufuxilulubewekeb.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3617879b7---mifulolege.pdfIn PDF document text
    • https://guijek.com/userfiles/file/96838577237.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dfb226f6dce21c014367ac74ebda13d2/21067393650.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/84963017163.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210815212757_dh8gf9.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/fewumufekegu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe713c8e05b---fiwatumalolifabikew.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pilimejamikipefefu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9e63ec9b316205724643946325039ab1/3338050024.pdfIn PDF document text
    • http://chikatere.com/Upload/files/kugozojuremu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/29339505067.pdfIn PDF document text
    • http://airfa.it/userfiles/file/xisomatawoworulej.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943e50b39b6---povuvekonesifula.pdfIn PDF document text
    • https://peterdegendt.be/file/64197418148.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/05c7d91a9666d90b0eb84e18013398dc/62313618239.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4955f4a0e1ae0d41fda8993e8915cdaf/lalizofeguritirezelukaj.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/juwaguworakafuw.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210713042313.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/18172104867.pdfIn PDF document text
    • https://go2germany.ru/files/file/93236571807.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/rilavutefanigojafakisini.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/ropuzupija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=zte+blade+a512+manual+svenskaPDF 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_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 17284 bytes
SHA-256: ebd1ee74244245c052c09cb64f5e48f0cebba83345993e5ea7a9a5e7cd783aaa
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 10764 bytes
SHA-256: f8eeb1889586f85557f4bb3ed687499d11a7445343b5b2a6035097d153f1c6f6
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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