Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af767488d13f7ee…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 22:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9317627da65c263b12c27f0c0bbcca1c SHA-1: 7b823384ecb72dc908b54515dd267f1ed2e22a70 SHA-256: 0af767488d13f7ee5dce1a64292c1160a6b6d8acedb9b0a5464bd75b30cf496f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://honeycontacts.com/uploades/userfiles/file/70381088553.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b128097---29339394799.pdf
    • https://dnm.tw/uploads/files/202109120615108975.pdf
    • http://piemonteforyou.it/userfiles/file/jiluxi.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec6b4cde0---surebuwiruxevuki.pdf
    • https://rainbowfurnitures.com/files/files/28640133341.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/jipuwesuwajane.pdf
    • http://arci-mp.fr/admin/File/64116620302.pdf
    • http://iaestedresden.de/userfiles/file/18284017523.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/fopojanabetewamipa.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/33319314181.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379819e6d64---rukedasojototuriwisatexow.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/sepokumonesedem.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca4c6a23e---96776518036.pdf
    • http://paradisoseminatrici.it/userfiles/files/bomududobajoj.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/steprm8plqug2agk1115v3icd1/wawopuvizepikawegodorero.pdf
    • https://ctners.com/ckfinder/userfiles/files/rivuxarewebutirut.pdf
    • https://mps-india.com/userfiles/files/30616704169.pdf
    • http://studiomuraca.eu/userfiles/files/44947509524.pdf
    • http://machinesupplier.cn/data/product/file/202191_231115_933.pdf
    • http://hieuchuan.com/upload/files/sefup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=noizz+online+video+maker
    • 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_off0000d83a.bin
cbce3f92d0303aea5dba276c12087e58810d70f27d566d5cd1422fbd383334ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 18096 bytes
font_01_sfnt_off000106ef.bin
eb043ede1d0545823a4c34ec432a1844c903a6d084f84cc1e0f2d7db5798dd1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 10336 bytes
font_02_sfnt_off00011e39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes

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