Malicious PDF — malware analysis report

Static analysis result for SHA-256 881037e7c308c1e3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 02:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a7936f0e0a3c7553188894648c357f8 SHA-1: 07e336a7dc063cced4cb121b8644a6dc5ecd2668 SHA-256: 881037e7c308c1e3c6bf78d7d388b24f395f36945b16c0f56aad1747fa45be4d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body is unreadable binary data, but the presence of external links and the high confidence detection scores are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610deb51c9aaf---41362679952.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9fbd4168cbd502c5827e277f34452a99/85108386656.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102db90aedd3---17169667349.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/00e3b426cec2dabdd94e09082bee281f/vepapavaxoro.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/72542777227.pdfIn PDF document text
    • https://etimes.mn/uploads/files/mipowovipi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9ed0a93f001954413c97992fac4140cd/78157095999.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a2h7v1lm40ajbjra5uogbabtcl/35638276932.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/40743833028.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16105c7d8772f2---5796103466.pdfIn PDF document text
    • http://rjt1.org/upload/files/bavasaxufitakinutabuza.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/ratuxifiwefutadaxuxa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ea5c1fd76---gumatomigunowutotejapu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b90266d0cf9---nevediwasofawovebebul.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/26765795539.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/61611b97add4be5a5b45b7b8d960c6ae/68852359677.pdfIn PDF document text
    • http://4yoga.by/pics/files/43650755884.pdfIn PDF document text
    • http://regmac.net/userfiles/files/mufat.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8b03b8254f7ddb15b34bcf83ced226eb/19281789260.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/nuxekubuvo.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/95819806593.pdfIn PDF document text
    • http://maidichike.com/upload/files/58052924478.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1ceb18d916e4daaf2f57d9a9c68b1b5e/wazobata.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6fa8194c6bdd832dced79160b24d791f/keguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=find+the+missing+number+in+a+sequence+calculatorPDF 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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 11180 bytes
SHA-256: dcbfcb3c008e0a84b7b170592bc33c9cbfc560185661868c26673ea42e2aff4d
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 15632 bytes
SHA-256: bb2516cb4787ffbab1f44a68c318e980647462a752e9b329175c1c02fd6c2516
font_02_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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