Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ea81b9d5bee8c1…

MALICIOUS

PDF

85.2 KB Created: 2021-08-05 16:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5cd045d77aa89f3ae9ba08338c8a364d SHA-1: 82289d7d4c321f4e6c71174b08b61a625c68ed8a SHA-256: 13ea81b9d5bee8c1aa8f1fe71a6f12595b96f1ed5e1268fb11c7d5ae05d1ad10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely lead to phishing sites or further malware. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://philabc.ru/uplcv?utm_term=en+10204+type+3.1+certification+example+pdf PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/om0fbjsfpjal96c5g2o0j94mb4/vupuwazamatudofomejijelij.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7612924931.pdfIn PDF document text
    • https://serka.com/serka/upload/files/sagupuzederuwu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/27527884781.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/6032135.pdfIn PDF document text
    • https://drlanda.hu/user/file/nanurijexe.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gjs3lim064up5esq6590sbh29s/duzapijixe.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/93630684845.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fosatuxajoxugiwexi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a192544f---7090950128.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/35818351798.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/k2pmlv8l0iqnismta2palbs4ce/pigabinepatujanarer.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/64873124398.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e7f690c8c88f46343526359e807d9ddf/kijexevobu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gkvldhj0cefv5aik0kp7bv041e/16300273565.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/xinegopoxunasobawob.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/75293610342.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8ab3bc7---95447119863.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/74873249989.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/82e8feeb7269cb8a8d412e6cf4259523/85433211041.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d22b42331---menepojoxipefose.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/15913416615.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c535ce437---18799966646.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_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 17436 bytes
SHA-256: aed135793091b8f216a5f329d4ad468ea862e185b03df8dfb995db527c8aeaac
font_01_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 11424 bytes
SHA-256: f27336c2143ff72093c3dc08ffbf96708551e7aba7541ef7f763b394e56988d5

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