Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f88bb53a7bbd08…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 10:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e65739766e55d6d9d9c764b1e4d5a234 SHA-1: bd63136e56af17428ec8c314763360a39e59d55e SHA-256: a0f88bb53a7bbd0825a20580921dbb11c2c1294138868d628d69b2f71f0d7598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a phishing or credential harvesting campaign. The document body is heavily obfuscated and contains non-readable characters, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=defining+and+formulating+the+research+problem+pdf
    • http://rayanchem.com/d/files/rulisel.pdf
    • https://lienlacanien.com/img_pages/file/8602600005.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb0612eac1---wutuvepuxupelutip.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fd49ec5c---33446468068.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3517ed257---peposilunorov.pdf
    • https://alzubidi.com/userfiles/files/zujubefogugerefeki.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c782e2bacd---5290439337.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a035032f---nerorapenasuw.pdf
    • https://canevastoilestjean.com/upload/editor/file/51467398306.pdf
    • http://firegallery.ru/img/upload/53238236179.pdf
    • http://gewald.ru/content/Files/votigizadolikonupikokuxo.pdf
    • https://hunglivet.com/uploads/files/202109010711208249.pdf
    • http://files.ibiza-ferien.de/file/15445468974.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f768cb2f1dc---77436056113.pdf
    • http://lokalizacja-gps.pl/userfiles/file/wazelilova.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609312c6e7fd0.pdf
    • http://bagiez.de/userfiles/file/divute.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/crkccnnpqamut45hi1rl5otshl/65421146561.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/cr0oq4pqd1h8j1ii8rjojuge4q/13916560498.pdf
    • https://thefertilizerequipment.com/d/files/25418958823.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805958821bc---69089639446.pdf
    • http://comp-art.ru/userfiles/file/2896987458.pdf
    • http://morpheus-architects.com/file_media/file_image/file/76122423950.pdf
    • http://podhoru.cz/userfiles/file/94111199897.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2c3f6f486---97516204526.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_off0000f274.bin
47ff598518fc46e27e0520ab7acea96c16f612972c49972559252f1e12d3394d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 17948 bytes
font_01_sfnt_off00012102.bin
c4b769112b4ad303e7f9af7809f940068997e4f5014e1a6ebe24e4a290dbcb6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 11308 bytes
font_02_sfnt_off00013afa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 16792 bytes