Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a27a9c995b9543a…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 23:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 011cadad31e3db32244ce7f923669160 SHA-1: 0842c14e53ffb7167db84ff6c9d1a89be2f84e5f SHA-256: 6a27a9c995b9543a6a033873cb0bb83804d87ca29f373b641aecbcd4daef9643
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/18e1ae9f2dfb1e6b3a06619d7ec404aa/foxakamize.pdf In PDF document text
    • http://nmglyxx.com/userfiles/file/57957293839.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0l34hjogfladit6s8p6ckklna0/65149567280.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/turiferija.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/80751745839.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608142569e25f---dukerogivodog.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/73360127801.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/13346553816.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e2c0fd27---vetodovadurusuwiji.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e37467b8e280e08a9996b1e191725a6/18480393381.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdd36857e---tanemupet.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sgv21bs70igjs8sgjcii24q9is/48411892920.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64652753ab---32140162922.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/795ab82f0908cdacff3af8f3d8829768/vafit.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fded75e64---3317103456.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea0b2f86e---nezizuko.pdfIn PDF document text
    • https://bliznacite.com/files/viwujuw.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3de4ac2a8---zozikufawusakeriwar.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dcdc58b81---waralopesavasat.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/1o0l0lnnmi60rvm28fvbb2377s/joledawonawenavuxewobu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/tamigorirudopavuziru.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/xarimunetegumodisako.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/31839948230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ffs+meaning+textPDF 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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 17480 bytes
SHA-256: a8b29523f1e4ea9e0c1ad0189a5d42f2d79aceae42b8a564c608508f668eee18
font_01_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 10368 bytes
SHA-256: 4b226b1a4254ec5d723369fbc734e50ce115b9d5b6c903cc7473f70a40e6a6db
font_02_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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