Malicious PDF — malware analysis report

Static analysis result for SHA-256 98940cbe0613a0a5…

MALICIOUS

PDF

82.4 KB Created: 2021-08-15 05:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a213eef9da614d1b04a4dfac69314485 SHA-1: a5f0d303225e7607ab1082eddb5020a5721cfb2c SHA-256: 98940cbe0613a0a5ab7a8770ccc2db5793bd398e498f986f3891f5f3e5d7c3e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and numerous URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8db8ee50f3---rimorefawogugudut.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a291f8c1c93---1109037085.pdf
    • https://ubranni.com/uploader/files/gawegabixesekipi.pdf
    • http://footstepfloor.com/upfiles/files/17550041942.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/52099026239.pdf
    • http://gumberryoleschool.com/clients/33891/File/mojetejirejesoxikebo.pdf
    • http://finpacecuador.com/userfiles/file/zunad.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210613_A0A07C4D0C74EBDD.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/44820052201.pdf
    • http://autosoftware.company/autoresponders_images/files/52328177071.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/28410690291.pdf
    • http://dioceseofniranam.org/userfiles/file/86579472042.pdf
    • http://pwmtqatar.net/userfiles/file/nuwexararuwimomeve.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2030e418d---ronakevaruxa.pdf
    • https://hinodanang.com/uploads/image/files/99776871450.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079884b0cf83---sugofavopegubiv.pdf
    • http://csc0898.com/userfiles/file/20210810042559_dm53er.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/scgbb0rdjb49mrk8p0ss5t2of7/98181802243.pdf
    • https://techson-cctv.com/upload/file/gonib.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/30508880724.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jdhlfnfe3rrg8jsbutslfio77u/zudazulekedifawoxineguda.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/feliwabewu.pdf
    • http://straub-online.ch/userfiles/files/jilasajaloxivosoposo.pdf
    • http://toyotarentcar.net/FileData/ckfinder/files/20210622_9A21C4C439F27D62.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c498a85aed1---62910890960.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reset+a+motorola+cable+box
    • 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_off0000de3d.bin
2b23c1981a8cd77d919d8392e48bf9625982aad697fb72bf1a869f9bf6e9d631
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10512 bytes
font_01_sfnt_off0000f653.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 16792 bytes
font_02_sfnt_off00010e65.bin
91375844b164db9f2974c6f80bf9e63a20d042f7dca856ba4c5a6ff6dbe1c49b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 17264 bytes