Malicious PDF — malware analysis report

Static analysis result for SHA-256 67be3321df4f7fcd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 09:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3189e956d3518a4c9764489862779a9b SHA-1: fb2c11ac3023bf0ab79c4140e30afe8163b3300e SHA-256: 67be3321df4f7fcde359e596df62ac620f50d82dd9098677f87fc30a33ac2ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it could be used to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marblobaths.ph/app/webroot/img/files/18220213278.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/61622523521.pdf
    • http://nutronicltd.com/userfiles/file/jupukosalovakoruja.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/rafazixeli.pdf
    • http://wittymall.com/multimedia/userfiles/file/vokolugopajolakonig.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0feb323f---80771507887.pdf
    • https://defi128.phpascal.com/userfiles/files/zatuwijelumil.pdf
    • http://gesundimjob.at/images/content/files/51441758557.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/raberobagizipige.pdf
    • http://pcccmiennam.com/media/ftp/file/paxarixoratijum.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_02_17_12_2876.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161413f6ec8253---tilirojovevufigimebav.pdf
    • https://tessuno.com/upload/files/613f92731adf9.pdf
    • http://joeun-it.com/userData/board/file/963705286.pdf
    • http://biosurfest.com/userfiles/files/tukatibodikazexe.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feac1c2a08---rabulubukatafuwezirilame.pdf
    • http://wsm.hk/images/files/57350339264.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/88251493817.pdf
    • https://molecult.metallo-tests.ch/sites/web/upload/files/8902212405.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161413de7602d7---rerefasagikum.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/23299188552.pdf
    • https://radekslodkiewicz.pl/files/file/wuzomatonudafumifo.pdf
    • http://abwessex.com/uploads/files/81734796906.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mercy+chinwo+songs+mp3+download
    • 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_off0000b899.bin
4022a3369defa7d37905235b165778f431b40cca71a3e06b1a96331e204358e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB899 15556 bytes
font_01_sfnt_off0000e09c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 16792 bytes
font_02_sfnt_off0000f8b3.bin
a4c79ef240bdacf1ace2c73affd23f278a71ee21c40728ce19111a7826abefc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 11228 bytes