Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b6d70051f11143…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 08:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 930fa074b22142c3e5f00e2f19659a59 SHA-1: 5d68976b6073012317e5622645a3e5b22bc65791 SHA-256: 36b6d70051f11143ad925abd37711d446c7aeb7d6ec69ba373f12521adce56bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=leadership+in+formal+organisation+pdf PDF link annotation
    • http://diysmart.net/userfiles/file/sarunavet.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/levolowinetu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/38965228386.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/ruxonimokufebovulazobunix.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/tuviwadawa.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/wigapavipibajobifori.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/60647328732.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kalajevadizoxolivuna.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210819103025.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd06125ddb---63626529976.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/22106372929.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/xipefifokinamemasako.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jezab.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5101cb023---37005577808.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/32811692320.pdfIn PDF document text
    • https://kuepancong.com/contents//files/95799421931.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5550a4c099de7d60dbf26a020351da88/liberuletapozawaravomuj.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/29308720097.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/kisodizetamegalupenutorex.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/40adee2644f9a025e2e17463ea063fa5/63574419365.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/lijosok.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7im4re912mkjkqhepjctfhcbr1/66811294453.pdfIn PDF document text
    • 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_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 10904 bytes
SHA-256: 574905150a83eb9a5a5b34c3eb57d41fe3214c955976118bf0e4a94b03f71d8f
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 16600 bytes
SHA-256: aa602ed578a8e30c4582d9dc1fbfd6bc25bf3e8869cc5c6bbbbc43abd01cd2a9
font_02_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1