Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e2a941847def41…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 00:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21bcb8886f476b842eeacc46c1e2f70b SHA-1: d53788218b6c562120737640e64d122aca808731 SHA-256: a0e2a941847def41cfa38ad554c52a29b0bf3eb094f93e87307fa2072192eb7f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic for distributing malicious content.

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ek5k6jmono55fib959l3nc5270/loruwupegavaben.pdf
    • http://teusz.pl/UserFiles/file/ruvawozeragibijoxevam.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a77c0951---56843707381.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/notibodusesuzugonabale.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5092431b45b2d90a43946d05d9093f80/55585830445.pdf
    • http://alarcon-v.com/editor_upload_image/file/16429694666.pdf
    • http://bajajsports.com/userfiles/file/89326055316.pdf
    • http://amandamaitland.com/images/file/kovumorutojapo.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e10716ddde---48075532306.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/77u8c4a4jmef1i53ccgte18bf8/14713540130.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/325781ee61bc3b233efa585ba1e07106/wufofelol.pdf
    • http://aarogyamedico.com/userfiles/file/guduxevikavogapuleve.pdf
    • http://thaiboxes.com/piceditor/file/40007618002.pdf
    • http://anandamsanyal.com/userfiles/file/dikiloxarasiwulipikekok.pdf
    • http://movementlab.dk/userfiles/file/99287976825.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rivoxigukelifevowe.pdf
    • https://ludifrance.fr/userfiles/file/wujozapazoga.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/75461724719.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3dee0441---74332951594.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83f69e6b9---90072675464.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=does+eating+a+lot+of+protein+make+you+poop+more
    • http://s292376414.onlinehome.fr/datas/imgmail/file/83737546558.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_off0000e51a.bin
ca12a88817b0eb63864bb533ed3e061d7935e6786610d75afd69615a0989ca4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 16572 bytes
font_01_sfnt_off00010fde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16792 bytes
font_02_sfnt_off000127f5.bin
cefbb310e0156201ae38588c741b6b94e08811ce8f25f9d111da97619ac7482f
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 11008 bytes