Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c309b47bb603501…

MALICIOUS

PDF

90.9 KB Created: 2021-06-26 12:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5de09df4b94538829d2020db1046b557 SHA-1: 00967973b04af132e81f30b0ce9b47be23a70a42 SHA-256: 9c309b47bb603501d7d64063ffa9e9fd9ef631b52d02280e66b444ddfa50987a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised or disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sunjewelsonline.com/userfiles/file/kagazop.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcc2f24dbd---wevaturesuval.pdf
    • http://www.cbs-emballages.com/upload/file/19595114858.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572ad3c1ff---ferakakuzetakorub.pdf
    • https://aarhuskortet.dk/images/file/sololipiwinowategolawu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7213d34727d586465ecc6079bf651d83/wemetebumabo.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/36f609ee53fe45f0f522c8d281a906f5/93629353508.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s9uvs6lh4n6ovmi8ndf6qv62ng/94941158294.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/rudewamorag.pdf
    • http://diamondsnspurs.com/clients/12200/File/mizubavezegirizelubuw.pdf
    • http://aceonlinementors.com/userfiles/file/zebetu.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/40a8b9c28234f5298c523b8ec5fa3f23/munifek.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/64c5c164f3207b5a0a544ab4abc8613d/10312738761.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93040b9d32---5196023785.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/gaguneditovexutoto.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/893f97b09858e475bec7c74020262127/xenitenonoravaxijitisi.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6042ab1da---watikuvadibip.pdf
    • http://dermaktif.com/imgup/file/80471880909.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/12239483614.pdf
    • https://ekransamara.ru/files/21702255238.pdf
    • http://vasvaripalmuzeum.hu/upload/file/45570325962.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/mexaxapiwujesoru.pdf
    • https://hosvagyok.hu/userfiles/file/kevud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apa+citation+of+class+lecture
    • 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_off0000fe99.bin
e0c009cf7f02825b2e3381f4b38cd1b94785b0bd28bfe990011e82870ece029c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 17928 bytes
font_01_sfnt_off00012df2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 16792 bytes
font_02_sfnt_off00014609.bin
e69f419e4740f9b903a6d2bfc26bb3bab342dac33a77666d77ed6da9e8070c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x14609 10556 bytes