Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa67d43e2a9a9b3…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 21:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d5eaa9b727e6e1a7d67977e7eb3f739 SHA-1: b1f29a82eb8db1e963e01c20aa387dcb4a4d8612 SHA-256: 9fa67d43e2a9a9b3c0a7a03a3469bb3f32c07d18cdc5c5d0d88c926faffae77b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://eurekaelearning.com/upload/news/file/bisuwege.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/81a61b05698fd72000ead5b08a88c4aa/zezixumuto.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/guzuvulafikeduzazonasu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4621a074---riviwuvonojavitet.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c88df9c2---zufenutuze.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754f3d4ffc2---kodoxiriguxekilulino.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/10a017d0960165478cabc0f427f051b7/xixezepapamaki.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/vakimemotukikix.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074169b2c44d---9940766843.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d363fce0e3---zobafegekelejasos.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6e96b140---givanazinalatafefupovof.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccd35116ef---bavewawol.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/29047031908.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e4b529a843f58fef13cd0863a23b5bc7/36773408489.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/16643321445.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/kagazibumimogeka.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0d8054590e0cd1fa9494956e50b9026f/28741109018.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/267301896a7d0a56a9816e4ec8ac0668/wogisagubinulexuwos.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5b495faef---xowumelijakabolul.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4da3af86---1206113898.pdfIn PDF document text
    • http://poorclarescork.ie/images/kiwoxakuta.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/31b2d32cc4edceb8c0e1882ed03bfd11/92896692292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+ipv4+address+to+ipv6+address+manuallyPDF 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_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 11280 bytes
SHA-256: ec6d2bfd2e1c3b7a929cd8536bf197e956358e56e75abc3198ae34d5ae6042cd
font_02_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 17488 bytes
SHA-256: 90bfbcd442e464f425b1273597c19c5ff4a98826546a1ab5eee1a499160c41d0

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