Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a802fd3c9e03e0…

MALICIOUS

PDF

88.3 KB Created: 2021-08-05 12:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2895bb41ee98bf650a0f5dfab2a06ab SHA-1: 22f486c4bd2c23babf1577b64aad4ef62d591bbc SHA-256: f4a802fd3c9e03e0d9e97281e44f4519dc8f43fdaf5bd55e86fe9f77a5239e05
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8197c1a8bd---sudozojesupobajim.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/kgdqd0ol2rv49u9ctpsif0jdfl/50492031729.pdf
    • https://ktmcollege.org/public_html/userfiles/file/2449752688.pdf
    • https://fontaine-eva.fr/userfiles/files/nujivolegi.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3b657ac3af0de749e21bbc7cc6e7c2e3/45605952547.pdf
    • http://alibabashipping.com/userfiles/file/95252015780.pdf
    • http://szakkepzosiklos.hu/upload/file/53441073531.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/sasuxiji.pdf
    • https://aslimitada.com/userfiles/file/22874476879.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a357b7c58---90886890940.pdf
    • http://sunarfactory.com/userfiles/files/gejaxevojezadibazekebob.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51a97c988---96709172092.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/766a0166bf3ba0a689ed765e1424194a/gikusonitatasopepidu.pdf
    • http://washchienluoc.com/upload/file/xibidakugapul.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibhbl32naobk00cbhc443fb7g7/92402933399.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160806f541ac75---812951891.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1pvgl9v5fllu6icd2bnn9bgdd4/32152022939.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b488d8cacac---53169280589.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sarurijaloraxila.pdf
    • https://netiko.ge/img/Data/file/xedobexufufidajasudew.pdf
    • http://pk.mo/userfiles/file/511199578.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7f7624c5fb61222338924b22f768658/62601970715.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/luguwevabubakigapeza.pdf
    • http://lateonsettay-sachs.org/userfiles/file/vasuselenezigosej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=suzuki+violin+book+6+song+1
    • 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_off0000f4b2.bin
4607e88525520c05b3bb31bb366a77caee90463a3b727c354ebd84987d5933b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 10544 bytes
font_01_sfnt_off00010ce6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 16792 bytes
font_02_sfnt_off000124f8.bin
dd68ac9861bd15c2c25b7113f31de034f916828f40ac692db5e524419da386e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 17320 bytes