Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb012f995c39ffb0…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 23:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f68eb73e6d12e079cfda0b6b26dc3a68 SHA-1: bcea47e7dcf3219297c9e71c2da70f07410970b5 SHA-256: bb012f995c39ffb0a3122b7a0c750f7890ea72581d6bbe478c0de950cc9cb579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=fundamental+methods+of+mathematical+economics+4th+edition+pdf PDF link annotation
    • http://nb-magnet.com/upload/files/12356287320.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/jutaninukafurorelar.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c9219920c15011aeee035d39054c2d78/31855382336.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/pojuvewan.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/32176540296.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/puderower.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/96159365905.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/30439591160.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/kivikak.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e605e2c32---44770161868.pdfIn PDF document text
    • http://consade.com/userfiles/file/nebagatex.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ab41c1d3b6fe47164e546dd42c0b5516/75817977633.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/31739909838.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/24691163491.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/28/kotinopi.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zixixekujakuwawug.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/46810249105.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/bovazinukotogokijopipez.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///68885583339.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/010c660788d4b9a71201a762c6dba41c/9029168452.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/98138889450.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec84123cf---rinonuparomotitok.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/81277513837.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_off0000b38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38A 16336 bytes
SHA-256: 49d8b4ae65bf14f3f4898f3294effa9769722cea171d00e6d0c0375c1296f190
font_01_sfnt_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 10940 bytes
SHA-256: 48eee5665b156c3692447c00a3d21737b07dbb129d8e980ef29eea3a8588076c

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