Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a4cad16a347cf9…

MALICIOUS

PDF

90.5 KB Created: 2021-07-27 23:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a448e80b244388212167d2533c9f5b33 SHA-1: 07e0514b946b057f0ebdbe30e2cc0702e9aee22c SHA-256: c8a4cad16a347cf92cb1d6df3fcb6326fbc5d2d7220facfd89ed0770a0cb462d
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other PDF files, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to leverage search engine optimization on disposable hosting for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://egyptsuntours.com/userfiles/files/xewewerozoxebijuti.pdf In PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/fenutojux.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2e52c6fe153fcefc365745833bf17288/58273833386.pdfIn PDF document text
    • https://alpinashop.bg/files/72124400778.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084caac9bf08---21140538859.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ed872790053---bizovuwo.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/rudinotag.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c04f1e895f5---48544877993.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/39253825832.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fafadixokamaxivapujew.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f9d7a678---83909672595.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98cfa0477a---53220022962.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc349c3e45---voziduxedupuwegomoxuloza.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kotepejasejulaneje.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/5858496577.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099b42c9853f---32736861159.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d8c16e98---vepudipamomugefiti.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/bagesoli.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5c593a07ec6b44ed00f5554b8f77b673/takojapiputuxolo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lubopenudusazaje.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609623e00cf2c---fotegixalipozexoxugumire.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608726c2a363d---botifupafixebumizaj.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e05c7d24a8---85126263488.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5afe47ddaa02a8c7cd1bbf071d3ee0c9/73093788874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=husqvarna+riding+mower+parts+lookupPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 17232 bytes
SHA-256: 7385336dc9d4bc00db0955fd45787e3fac801313e65ae9ff8bdde549fac9a863
font_02_sfnt_off0001422c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422C 11216 bytes
SHA-256: 2b1100d8910ae04fc7252f1d5bc7defbfac3c7006b546e4e8d36a1f6e13d7a9f

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