Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8eafe47cf7d7fad…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 12:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bc909c1207b64ca0c89924d21e5e7c3 SHA-1: 01509ff5d9e9af6611a80beacfd2a46113053002 SHA-256: f8eafe47cf7d7fad5a179ae64dcc27eeed70956e7b0462ea8ea828569b673e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute further malicious content. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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://musiclivemarsala.com/userfiles/files/90799440.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/fexinemukukamosil.pdf
    • http://newdimension.su/userfiles/file/wakujojivomekokumed.pdf
    • http://adams-gold.ru/archive/image/file/bezewat.pdf
    • https://sasalidayanisma.org/uploads/file/dolaturonuwazi.pdf
    • https://akonis.ch/userfiles/files/19533252881.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077639adadb5---89190753981.pdf
    • http://xsjsbzrw.com/uploads/files/xamojuluje.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a4fab122317f790fc870ae8c0b5c1844/129078666.pdf
    • http://emeraldcovepartners.com/_data/images/file/66249811307.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/5287577409.pdf
    • http://4bx.pl/public/file/rukalawadudewisezaf.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8k25lmnrkkg76s0vfcouh47cf9/vanulevuramaj.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9c660c2ee---54555779006.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/21676255412.pdf
    • http://terhautz.com/upload_files/files/80143169756.pdf
    • https://biomisszio.hu/tmp/50449457184.pdf
    • http://anthonyvienna.com/sites/default/files/file/zojal.pdf
    • https://cezartravel.hu/userfiles/file/zodobirene.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210812_D0E4DE016BBAC4C8.pdf
    • https://asthasupermarket.com/userfiles/file/vuxomubosan.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391be37757---lepipixox.pdf
    • https://chv.vn/userfiles/file/furokufutune.pdf
    • https://svingenieria.cl/userfiles/file/gefivare.pdf
    • https://diphong.com/uploads/31565592708.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lista+de+verbos+regulares+e+irregulares+en+pasado+pdf
    • 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_off0000eee9.bin
cd71e6a8c2541702a003ff526e0b22c6346694e0ef83a561cfda9ce59959b77b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 20896 bytes
font_01_sfnt_off000123ee.bin
708a6b3dfad85725d924c7c6cfb3396c74f17db24f1232817e8b83405acb31f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 10936 bytes
font_02_sfnt_off00013cf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 16792 bytes