Malicious PDF — malware analysis report

Static analysis result for SHA-256 110752c249169e13…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 13:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e66aaf54b925b9293a9581729931dcc SHA-1: 79171601deb2001a5ef555f1bcfccd4b5dda7d88 SHA-256: 110752c249169e1382a14a0d24e06d9c86f9661b2ef1cbaade4f29d45180e89f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits multiple indicators of malicious intent, including being flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'password-protected archive' lure heuristic further indicates an attempt to trick users into downloading and decrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=convertir+de+jpg+a+pdf+gratis+online
    • https://binarbaidtrading.com/public_html/userfiles/file/88489206448.pdf
    • https://avenue102.com/uploads/file/bunamalekatujugulap.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4410b48eeb4d05437189622ae8045e7a/35198369281.pdf
    • http://jaluzipro.ru/public/userfiles/file/95732757219.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5bebf731---94199293128.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c18419ab---87495078679.pdf
    • http://thecreditcrisis.net/clients/73966/File/dolisekuxasepavugoxubagul.pdf
    • http://evaemlak.com/userfiles/file///43345252991.pdf
    • http://www.prieteniitehnicii.ro/documente/file/29839268216.pdf
    • http://quaretti.it/userfiles/files/88742694482.pdf
    • http://szkolka-wiercioch.pl/files/file/woxipuridap.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/75270735311.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/37e3b72f75d08deca28fc26632b7b666/23697423302.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/vozim.pdf
    • http://airsoft1.ro/files/file/53024440718.pdf
    • https://pearproperties.in/userfiles/file/8398437047.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/takos.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/78849c47d51e638cf49fac3a6bfd7dee/90680193411.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/l2f43vk1905o9gfep6k0h2h0j3/32474314002.pdf
    • https://transport-vehicules.fr/userfiles/file/mivogizugo.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/3kvqrjn6dq4ck4ulot4ffrct24/jufepasetot.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/grd3f2kq9vtg0j8psrjpcrthoo/disesur.pdf
    • https://heritagecambodiatravel.com/userfiles/file/wijuparewuzikexu.pdf
    • http://abogarestudio.com/userfiles/file/70880809468.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46036302927.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9ab6gcptqtrsfii2t7cg5j4kb0/ruwuzi.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_off0000d81a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
font_01_sfnt_off0000f02c.bin
60339f1a9e3f69a997a513b19cf9956a7507363894680a768055dc77d042382c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 18444 bytes
font_02_sfnt_off00012023.bin
a0caf68c738532a8e75b1291c6245046ebc83c333f7771a7dd0294d3f81e63ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 10900 bytes