Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54686aa570288b0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 23:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3abfd2111f44d5227cffc3610fea9dd6 SHA-1: b887b8e9e719f7bf56b4feade7567bf93296ba98 SHA-256: e54686aa570288b0412bac9c75c0872a7e32439773c4729a2275b560901eea5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs further supports a lure-based attack pattern, likely aiming to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=ingilizce+t%C3%BCrk%C3%A7e+s%C3%B6zl%C3%BCk+pdf+oxford PDF link annotation
    • http://seoulsquare.com/userfiles/file/zokipe.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6204d3d688538c2bc17d785abe0e7d6a/64420580353.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e16b21ee7bd45ce711b6206576ce0cd8/navakox.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/kakomipukazekikidiwesare.pdfIn PDF document text
    • http://zenithmetals.com/files/36092034142.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6990c370c2---56642682649.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/26841875354.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072004a806b9---vuvomojufidazamosut.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/96551342017.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b86fbe30b---basesotexap.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5625e7ee3---wogebidugoberu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/lijofenomifuwimebina.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea3c6a0646---6452194955.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/91519864277.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9a58e342---wulut.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91862176323.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d5cc2c31---49285178477.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/damitek.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9676e7bf96cbb0756106e826aca50b25/labanabuvone.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/jozedoronuxowo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d139d014---pinuwutonapofasif.pdfIn PDF document text
    • https://5uempat.com/contents/files/42296347997.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/48548126585.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/21115650879.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/35644483147.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97618a50f---91671526999.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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 18948 bytes
SHA-256: 8a28d091935bfa75267795cd9c32a3e292046ac8e9edba94c3694adc01d32bf9
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 11444 bytes
SHA-256: 51ebe986195564ed539cbc159084f3bdc7297f8c3fc38b80b4d17f8c3267b786
font_02_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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