Malicious PDF — malware analysis report

Static analysis result for SHA-256 f681fa88b3fcd8ad…

MALICIOUS

PDF

77.6 KB Created: 2021-06-29 23:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2339dea2c392dfaa169c48be3ed7b62d SHA-1: fba286b8250a1eab5b42276a333f9b74d462d60a SHA-256: f681fa88b3fcd8ad7eca6dd3fa35a724fcb7f18a1c7560167db507d201359242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs, many hosted on potentially compromised CMS platforms, indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.bandungmesin.com/file/61872194153.pdf In PDF document text
    • https://oklogistic.lv/upload/file/dutaturalukekupafutuji.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9d89df57---karepozufoburoretufabak.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/nonapaluzosuze.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e73ace80f26bc6c844ad308e37e32956/92367363889.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b3376d41---gelavufubobidavile.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/79bbaad1e15a691d7112a60c53fb72e5/2336076145.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/242524bda7a0e1da013db0ecc400390b/mawapatolezod.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/wizoxuginewaja.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/24205995051.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2abbe874---nujotumemowivewoximox.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c9b0c033afc76fb23e16c5fd47a4b6aa/45510016904.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/teketegit.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a745786d---fowedopukaze.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c20fd0dd5b80ff4a965344d2e4ef414a/155590063.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/69lq7pdg8s1k5erp3k9bg46nq2/16595306682.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4be4cfca---62216928075.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5f0fbbb7644cf9cb66c1c6b91e5243db/59860900314.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4911bf34d2ef3e365381732373f35d94/49180832568.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160932c6204a18---39262694293.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q5791tbil4pc7cntj6tnpk53r8/93194330833.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/limukagosozofikotabi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160adca81320b0---9216535511.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/50113168971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=meiosis+quiz+with+answersPDF 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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 16800 bytes
SHA-256: 6212335a2c67748fa515a7983b948acd6cf6332eca1a9cbc3e4840bd2af06bc3
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 10544 bytes
SHA-256: e7ad4bffeb9130adfa0fd0b69a66826f29cce38ac7d3ef8aee13ec3fdcad09d9

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