Malicious PDF — malware analysis report

Static analysis result for SHA-256 e993bec39224d7b8…

MALICIOUS

PDF

86.0 KB Created: 2021-07-15 09:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d6865d1a0ccf8a4d07b5259842fa801 SHA-1: a5f29a9651a1d82f569bca5ec5f740356cdf29b6 SHA-256: e993bec39224d7b8bfe997e0dcdb08478014ae0ec7c470942f8a719faca85aa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs likely serve to redirect users to phishing sites or download further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3713

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://ketchas.ru/uplcv?utm_term=software+interrupts+in+8051 PDF link annotation
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/sochfuhivtqlerinj9ccdbrhjq/lepuwukezopazaposev.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/34784131631.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7a38cf258a186a44dcddeb8bc4e985bd/28680705144.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d0c11eb88---97979068823.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/61v60ljfmoi2hnpf9uefnm46g0/74159563697.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/41386354928.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c369cfdea---19821381099.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/tasiwuxepowovexuxazar.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/miwilolunosubora.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/e46405376fd2bf4795221e9b83add0ef/77213953730.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5ffb2bc6a442554bbf9f0e75ac4f3ec9/7400018299.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/93ffd7a85c765f2ceb7b056182cae0b8/nasefezimiwimapikotaw.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d512ed3930b---85872651640.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/m4dd8l2hp6e5vgjskjvb9tc1c3/81989173906.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ed67c7a---gezepopanag.pdfIn PDF document text
    • http://skncn.com/u/files/70031553706.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/kitus.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/katugadutoxuvisem.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/11277674105.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/dakevezasi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/50f21ae079f949351faae9275cbba3fc/88700948524.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/64137966155.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mkcmcebvskdspkppkhggqr8ctk/vufulif.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/psfhp24jvd1h3v579piqteke2v/dakabekabavixesadugo.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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 11080 bytes
SHA-256: 47dfe90e6e4b27212cc2d511aa42980b9d06cd79e9edcf57b11e707bfc255c42
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 17580 bytes
SHA-256: f714c557fc82b97a9f4a45866c11a61e0bc22df26b904fdd7f29795eede20bb7

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