Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3db6cbf3b304e…

MALICIOUS

PDF

97.9 KB Created: 2021-09-08 01:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0305af4c3979ab2e4c71f0f065faa8c0 SHA-1: 3f218b083c52580999cc28566d36ab32ccf8ad53 SHA-256: 5af3db6cbf3b304ed1470de0d81cf249c89b0e508dd71a29a211ffac8c79d0f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the true destination. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://muratay.nl/userfiles/file/41515382591.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691779f9b0---gabezakixib.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/26091441692.pdf
    • http://davidlbrooks.com/clients/868292/File/gurujobigasefojiranigekin.pdf
    • http://siciny.pl/userfiles/file/vofudemibexerisokovini.pdf
    • http://sys-svinding.dk/userfiles/file/lovoje.pdf
    • http://www.heksan.com.pl/file/kajufurulinu.pdf
    • http://braciszewska-klimek.pl/fck_files/file/30115760956.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083859da8a55---47830861830.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3ce7ded29fc6e2405d5bf5fa5832cc44/12735486137.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/049869e5aa5bb4f9ab251b7a90676ff8/42217630542.pdf
    • http://mfahk.com/upload/files/36545822327.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/lululuwu.pdf
    • http://reflita.lt/uploads/files/xelabotuxamekiterup.pdf
    • http://concilianavarra.com/userfiles/files/xasutibe.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/02bafd033afcd991d2a6e93332fb93fb/basale.pdf
    • https://bravo-hk.com/userfiles/file/jebinasigewavanixevofodiw.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ba61e04d---zegil.pdf
    • https://noddy.nu/images/file/69072172623.pdf
    • https://hurghadalife.net/userfiles/files/75396730861.pdf
    • http://blackhorsesc.pl/userfiles/file/63289109465.pdf
    • http://andreaslasnik.com/data/files/rubimo.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b702040d0eb672fe21c4fa52759b9fb2/87955384770.pdf
    • http://to-tuong.com/media/ckfinder/files/14060447214.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=razonamiento+abstracto+ser+bachiller+2017+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_off0001143c.bin
de8af8479fa53947544baf9fc5f67833d4f6c343beefebe720e197145613d075
pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 11476 bytes
font_01_sfnt_off00012f1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 16792 bytes
font_02_sfnt_off00014731.bin
1e23698f085b68c6efadf2fadb86814b1231709fd47be0283e1aed26fa355f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14731 19724 bytes