Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab191afab90adb1…

MALICIOUS

PDF

72.1 KB Created: 2021-10-06 00:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b892cc04701ae1171f332813c587d4e5 SHA-1: 5991e7bc5a39669118c916830032bb8027071c24 SHA-256: 8ab191afab90adb19b258bae7071980addbc82e5327a98aef790d71dfd1db36e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The PDF structure and the nature of the URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3549

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://allytemp.ru/uplcv?utm_term=present+sentences+in+english PDF link annotation
    • https://sistemagestiondpr.com/userfiles/file/varuvamixul.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161417be5eedea---85379495665.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/taxawevajimomubemaw.pdfIn PDF document text
    • http://qdjshg.com/files/file/xubodobegozujikul.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/luvopilasiva.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/2370493726.pdfIn PDF document text
    • http://egitara.com/upfiles/files/5385788107.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2246604f2---dipevatomi.pdfIn PDF document text
    • http://live-net.it/file/zazibakezoripasagukifuri.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/legawo.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/rorubitevot.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/82995888093.pdfIn PDF document text
    • https://electroagro.es/pub/files/8231679047.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/88144284810.pdfIn PDF document text
    • http://vanhacollection.com/images/files/nenurusumezenew.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/22258896772.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nukerogatofanajokovipon.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/jinoxevil.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/43882048656.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/263d27465e3878dfe34b631e27354cac/85990229581.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/ledebux.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/17983163613.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wolutubivis.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/tuseminojuduwalimufa.pdfIn 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_off0000c419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16716 bytes
SHA-256: 4b899c3c154bb4a76e306929d945778ed112490ba132a25126e1cf1eeb07d5b2
font_02_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 10228 bytes
SHA-256: 3dd3e0ef81d379d2b5af9ca3c7393dca8105b5399f119d634e9f0558592d8171