Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5665d7d9df5047…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 08:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5780c82098cb97eb66f6487ccfc6e2e7 SHA-1: 748d43d2c227c723c89a04c8ee6400a14af7be98 SHA-256: 1f5665d7d9df5047fd4bbc338da227fc98c9f9da433817afec047d63122e74a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://newtech-utm.pl/userfiles/file/makupepe.pdf
    • http://sjar-tech.com/uploadfile/file///2021062301591625.pdf
    • https://alarrabnews.com/images/content/content/file/93444128749.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0492bb0ba---83840406587.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf38c89759---43392868616.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160732ae8333ea---60209964252.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fcfb36692---dopitukezidutefi.pdf
    • http://www.mostenpo.jp/userfiles/files/91170220884.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/0529cb649085876e2dd13593f5c3ff02/sosafulamolujurifiviripaz.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d3c26354d886cc43fa9cae7abacf3931/38443297137.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5eaa40d9---54301824102.pdf
    • https://bdsvieclam.com/upload/files/tiluvetoxunitufavirunonu.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa85860613---14727611322.pdf
    • http://conblocmanado.com/pics/file/rabozet.pdf
    • https://geneticapanama.com/userfiles/file/zigumepinuzogefunejonanif.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/97602998146.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/nebemeta.pdf
    • http://weifong.tw/fckimages/file/40161180325.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fae98a79e---16434733534.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/69077180425.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb0724524d---75144240388.pdf
    • http://studiobonvino.com/userfiles/files/towawula.pdf
    • https://xosobacninh.vn/webroot/img/files/71313005624.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=seacat+636+for+sale
    • 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_off0000f07c.bin
1b76fb40d56877e46c18bb39ade2722697c801adfa9a96913b1fb980562c3fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 10548 bytes
font_01_sfnt_off000108b2.bin
8b876160890f4562d02f30664923c90c390a2250eec2a432337ddca3707cd425
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 20128 bytes
font_02_sfnt_off00013b8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 16792 bytes