Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e2f102bde2b95e…

MALICIOUS

PDF

104.4 KB Created: 2021-08-08 05:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 280c640f2918e815b6297e36a214aa48 SHA-1: 0046cdfad18e42d1004f4c388847091a62457323 SHA-256: 31e2f102bde2b95e6a7fa759d268c38a197a1be99442d2c27289068e0457fd1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. Heuristics indicate this is a link farm, likely intended to direct users to malicious content or for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d57b7dbe2---xevuboneloz.pdf In PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/37803710103.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/21095468519.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610354bc9f841---95635511193.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ade67fe6c28a3e962c1f112681ef46e3/satizatojabubexakimes.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ab47d7d6---sabunamibufuweromanu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/1721743431.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df072ec89---12070215929.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/2837713471.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7cd49e1f135ee138e047251fef8bf4b/piweduselosexu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/gabiripito.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f2999738---guxaxodabawunilano.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/21134331893.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cbb984ba153ecbe65ec0f909ced7d2ab/zodozebolizu.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/40953627353.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b2ec9b166b9f90973ca3fce7122830c1/gejekiwatopugelofopofuvoj.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/23107742730.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3327353198---43410657412.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/85ce1756f040ec7169df555645abe18d/madikuzuzugizabutefo.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/webisuwiji.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zoruwulipabuso.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ii59k3r5v7s4aqqh09s9r02qtm/dakitutigixivegipoxabebej.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/golakarig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+san+andreas+cheats+apk+1.08PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 10932 bytes
SHA-256: c8b20a863e0aea059aab9ef76baee842dbecf2da396c99608993ef69f7a5a3ad
font_01_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 4224 bytes
SHA-256: 5c6197dfb70ee9dfb2eb2c69647b458d66b110058a397aaabb34ab5733f30508
font_02_sfnt_off00014478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14478 21720 bytes
SHA-256: 00899a7d4fec0c8af1e3d4f3ca3c76687b18a40afcd199b8d1ffa8a9da961782
font_03_sfnt_off00017a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.