Malicious PDF — malware analysis report

Static analysis result for SHA-256 2195afbad6076221…

MALICIOUS

PDF

121.4 KB Created: 2021-07-19 11:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56c5e43db86546c926aec0de381b22ee SHA-1: 69461a86c72d1e5cde3c2837db00b4be4c402983 SHA-256: 2195afbad607622148d026fbf50d944f4680786f0d2724e286bd5ccedab8b45f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b8960fd1ca9---98126068603.pdf In PDF document text
    • http://voxel-avocats.fr/uploads/file/fuxowalegapunede.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/59229434790.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/vixopenifagejigud.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmi3lu4o9mbglorhg9t9a0jct7/tivebonolakevaba.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/vanifimomeme.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf3b512a6---96372127809.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5082f8dc66---60037065125.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vcts5avskql0acj95uaqsu276u/gokubafigadetuzaf.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0c8cddcc9b7298b07f04cb980024ce32/xikuxipipedukogidubezebil.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/luwafuxegavef.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/28850299614.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/2314009468.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f459b1297ca398b0f13929d884972da4/sikefavibexibuxukeze.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f4683dd0---56963424447.pdfIn PDF document text
    • https://arerp.kr/data/file///figejelus.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/konadajamazeximiwa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2f84de190---50809079853.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/61129255972.pdfIn PDF document text
    • https://aromamarketing.md/img/files/kafuzaritigivojobifoz.pdfIn PDF document text
    • http://alkanboya.com/files/file///96924933098.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c392e88592---96433212336.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/toxojos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=king+louis+viii+of+francePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001b2b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B2B0 21168 bytes
SHA-256: f6edc7563f55daff05b74050439f91544109b10577f30c29b65b1cca705233c4
font_00_sfnt_off00012a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 29592 bytes
SHA-256: 2854588f85b04634d07c30a637693820d11cebb8c0074255d1989ccecfa3b6da
font_01_sfnt_off00017392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17392 3716 bytes
SHA-256: ead1b3d8987671b4ab2fd83657e0bcc793c2bb3715cd8b455baff6663e115a0a
font_02_sfnt_off0001825a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1825A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A71 10572 bytes
SHA-256: d7efed94c7600b06b7bfed6d145bc89a726b7764ba5089c4a155b6a45929fe31

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