Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9781a8f634f0a05…

MALICIOUS

PDF

104.7 KB Created: 2021-07-06 07:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d135376279f781afe74e999aa1f842b8 SHA-1: b46ab2bc9364c8a55057f53a1964b658c72b70d0 SHA-256: f9781a8f634f0a052ceba237e5b152cbf06a30f16d97ce412f8155463cfcb864
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and does not provide direct user-facing content, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 http://botosani.ro/img/uploads/file/51758555119.pdf
    • https://mebelihome.ru/upload_picture/29007778959.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba809a95a1---kekozafifukapevevuwiwovu.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/wogeki.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfd8bb89d---vugarumodigevonubakaxemi.pdf
    • http://orkoien.com/userfiles/files/71993518919.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac692479a3b---39160703979.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160832085ae403---29350522931.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d35c20229e0e31c524652651a4def366/vebejoridodetebiki.pdf
    • http://fanti-fitness.pl/uploads/assets/file/97086825228.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5433203c6e---vivode.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083057d1f48e---84441160950.pdf
    • http://chunmianxian.com/upfolder/e/files/20210619120855.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d49bbf6b8eae3dbd824a0dba2dd9eae/lanaselubonuv.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4c1b013d3a02ed92707a0603c92302ec/falune.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5747b8399---20292044719.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/sjnseld87i26j2sek5mrdn2u90/83638025282.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ead0d7813b---lilosasurekezoxoja.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7841b681686be75f74edc9f542b6c411/79191058703.pdf
    • https://kartplast.com/resimler/files/9605942322.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e14379c5---69408632425.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sleqbt4cke4oelc2sqfu3nfn9g/jofomeleteg.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1ab9e68a.pdf
    • http://controlsystemco.com/cache/fck_files/file/zoxogifatavubabi.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2367b8cc---biwegap.pdf
    • http://mhinflatable.com/upload/file/89383225313.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5306feec---fizesufezadebigeritodiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=limestone+made+from+shells
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001228a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 16792 bytes
font_01_sfnt_off00013aa1.bin
1928f49e83d66b3eec663049efd58e4cee1ce591a7e4fec487799fb8359be96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA1 10576 bytes
font_02_sfnt_off00015282.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15282 16252 bytes
font_03_sfnt_off0001685e.bin
e84fa7ca58eba1fb2f42f01e23acfbf57f7f3bcc48ff03c9d63856006a3ccb4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1685E 17048 bytes

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