Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a5d11f7b1a349c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 17:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6c1c66652c2c25d7704025af7005ade SHA-1: 9cf5eb302227788ab6384d0a79f385a7eb17319f SHA-256: c0a5d11f7b1a349ccd1e36912f7e04c8742d5185caab86f7501f733923eb532e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, which are likely used to distribute further malicious content or phish for user credentials. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5276c9d9---wutebulapon.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lubezesovolupenanixawujek.pdfIn PDF document text
    • http://altinay-law.com/images/file/99133767153.pdfIn PDF document text
    • http://kodemari.info/data/files/79102082040.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/wirisusubutofoz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f825a22a567---bisitide.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/mujavedazijuseda.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2bb2d27ddrkbl35t5sf7vnr37q/71948817626.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/xinakozeg.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081519081335.pdfIn PDF document text
    • https://atavio.ru/files/file/xujuvuzowasefeta.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/12287023183.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080840dba4bb---6474855720.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/66255651816.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/24700061719.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/30831118607.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/kuranujemurovanadaramoz.pdfIn PDF document text
    • http://mlead.net/images/e/file/zumikawirig.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dr26ec295licgf4l9t6vlphq3k/73964266206.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/81455060975.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/lefawawa.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/45177200654.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kb06v1vil1eenahq5meb35rg21/zadaponubufibesovisoraj.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e94109fbe49f03452c1c5efb002271b1/mafoxowaturevux.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d2051029b---rutovegolaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kubla+khan+poem+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 11212 bytes
SHA-256: 3679f0a40f1e4699543bf925c2c259e202e03581ddb09fd44de060f9f084afd3
font_01_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 17704 bytes
SHA-256: f551a8c2f6921fe652c6b52dc4c9e5882641c7d121ea4dc61181d6b350dc6fb8
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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