Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a95db0948b5151…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 07:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25a436753e8a7c25dfb73eb29941d1df SHA-1: f5e82e5259309c3ecd7f459d9fc0856540c7ae59 SHA-256: 89a95db0948b5151edab187c1901398419bc81efaebceb925618328c317dcc33
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mfcwestenkwartier.nl/beta/userfiles/file/gakawamovuvadexuvok.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/172a008b103fee158c963e62b19dd7f4/valinaxilido.pdf
    • https://emmaushuis.org/pages/70554621723.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5d1bdbc3---18510767440.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4a11de94---bezidifuxigesipema.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c085b8d4a---fafifoxefevaxo.pdf
    • http://grandp.ru/userfiles/file/tovolazafalilazaxuveju.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/235b6e3c6ac852e5cc8b4c262980a4af/25448934732.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f578862b---rofukavafepebuxatakevij.pdf
    • https://promobryansk.ru/userfiles/files/govikibeni.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb278bb253---53230240548.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6b590bb82cfebdb689388adac1298abc/sakid.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/43729708663.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ju6r33eiif0okb033hajcjn0q4/vawinorupivikeno.pdf
    • http://oreade-breche.fr/userfiles/file/99648732360.pdf
    • http://ahcxdq.com/uploads/file/070642032884.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a5dd517994be9a319bfe41da6317b5d6/kizagomozirifemiked.pdf
    • http://keramann.ru/uploads/files/77099358895.pdf
    • https://vettercycles.ch/userfiles/files/ronezuramivutevuke.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f00d15b08---16634268888.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a81106279a4409e214c91739e8ea0abf/wogusapufemokofenirofi.pdf
    • http://keralabiblesociety.com/fck_uploads/file/velezoferutomifagi.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b38a1b78d04998a3fe12d0edb4038033/1069483126.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=new+enlarged+prostate+treatment+2018
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb7.bin
31f0d0cce3c5090c7c0664267d0da5e051e97f48cf4659c404cde702a06b4a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16696 bytes
font_01_sfnt_off00011b30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 16792 bytes
font_02_sfnt_off00013347.bin
1f46665024ac17b85c222fbb6d49c657f9dc2129240dc84194fc9a5becdd399d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 11208 bytes