Malicious PDF — malware analysis report

Static analysis result for SHA-256 92316f335c646c30…

MALICIOUS

PDF

84.4 KB Created: 2021-07-01 15:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 192f29191322843e95ecf8dd1bf34fc0 SHA-1: 021dbcfef4afd3399e6937b94166865ce9022094 SHA-256: 92316f335c646c307fa7f5d12a142ea07c7d2dfd3fb0964423c571411909f8bc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic firings related to link farms and potential phishing lures support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ucjho4bov4co1f1esjpu7m50no/60481411510.pdf
    • http://yomamasushitogo.com/uploads/files/52750169485.pdf
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/29942270788.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f4c0c8e2e8df38219ffbd7742f569e42/zijuxexugupatuniferivitil.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/34cckh163o54thbqvlsk0fbrfd/niboforabokamalexubekafek.pdf
    • http://ebiocell.com/uploadfile/file///2021061623061163.pdf
    • http://isgsrl.it/images/file/23165864407.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4gphc1jj8mhm1n8vde58fckcp6/tefunonowutala.pdf
    • https://agentcctv.com/userfiles/file/zuvosutewajefezijas.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c2291d82878f94a526755c85ba0bce38/vapomomepes.pdf
    • https://adian.eus/files/galeria/files/kowevifakexejemu.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/22230d408a00cad515a83cd2b66f0782/10696354292.pdf
    • https://namhunglogistic.vn/site/files/vupamoz.pdf
    • http://studiotecnicobonoli.com/userfiles/files/kofabofakeru.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b606ccd093491d33529c3c7abff99045/39759465538.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbce5bfec---matedatebu.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a301a63ed95bdaa06df95ae5266cdc89/35342361341.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160adf28b7508d---17348656351.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/53545e32089f598ed7c5db1de47293c7/23587487091.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mobdro+download+on+iphone
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b87e452d15a8419c4baad59845b6741a/43253210968.pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/78131097928.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_off0000e71f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 16792 bytes
font_01_sfnt_off0000ff36.bin
41011f7ca1e107ab3dd3f49a9824f99ed33041816869533d5243de4ed754b7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10440 bytes
font_02_sfnt_off0001168c.bin
c4b96300821f325afb071834c0fd5c7050e39cbdbce657d9665992aefa25056c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 17564 bytes