Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f88d978f95065c…

MALICIOUS

PDF

72.4 KB Created: 2021-10-03 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5602d4caa07e7316110395b5be39f4e3 SHA-1: b94cbfffb7769b6179f1d8fa06b1dc86bc5bf27d SHA-256: 56f88d978f95065c812d14d4f02e043eb55b55deef22b181f25e427301050fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to act as a link farm, potentially for SEO manipulation or to redirect users to malicious sites.

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://coretry.ru/uplcv?utm_term=pdf+link+to+page+number
    • http://ingpiazza.eu/userfiles/files/19204487905.pdf
    • http://acril.ru/ufiles/files/46821396234.pdf
    • https://shevian.com/images/file/49265129502.pdf
    • https://mama-light.net/business_school/uploads/file/gejumelenosenewo.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/3069437218.pdf
    • http://swiss-ex.com/images/blog/file/kimus.pdf
    • https://y3stwk65l-mn9.com/contents/files/pajezubopupifela.pdf
    • https://consultemergingmarkets.cubsindia.com/files/50227568483.pdf
    • http://kashima.cc/userfiles/file/jagofegomasuwe.pdf
    • https://amoslodge10.org/ckfinder/userfiles/files/fozuliregebusan.pdf
    • https://possamaiferramenta.it/uploads/file/wibijofatazupuwimitar.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/bexaxijijuri.pdf
    • http://massimosusto.eu/userfiles/files/8680259962.pdf
    • https://hgindustrial.eu/userfiles/files/66180118423.pdf
    • http://phutunggiahungoto.com/uploads/files/zesovezugugezizigoxufen.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qel9uvi0t6i17kj1fs72fpbf48/losejuwarozog.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad451eef49---vilawutozudodexovano.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdeeba85b1---xorolopupozefifaxofabapun.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0b625df8fe8b22ec3ea71987dbd899bc/651406454.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/wevoripozirupasifip.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/25607563396.pdf
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zexiwoguneliwu.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d32657d8471faf0f91e5892d056175f4/suzepiwiv.pdf
    • https://amt-alarmy.pl/userfiles/file/nofoxapovuwazojok.pdf
    • http://fteq.ru/files/file/26488693882.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_off0000b561.bin
ae57639b749ee335d6281243b54929792241b0ab74e2e047869c5a62545829fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 17676 bytes
font_01_sfnt_off0000e297.bin
af2907de90211854674282e3ae387ece3d1ef3de5e3f44cf3eb2f838cbbbb5e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 11004 bytes
font_02_sfnt_off0000fbac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes