Malicious PDF — malware analysis report

Static analysis result for SHA-256 875dcbc162ac3522…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 08:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49224b7ba53dcf115a49a37bede9f048 SHA-1: cabd5b98895fabfb6ae7e62d9d0470a4d28239c7 SHA-256: 875dcbc162ac35225da8ee1b9ded45d8fae2156e859dccf7ac5d601e03ae67f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

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://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/25226455993.pdf
    • http://nadiadsa.org/userfiles/file/wapepadigipenoxap.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356559a024d---88008790955.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bbdc358dc7e722530a88d1250ec76880/kulejokopumikikejane.pdf
    • http://architetturaurbanistica.it/userfiles/files/jigubo.pdf
    • http://lg-palette.com/upload/files/gapoxifudavud.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1179d4788e0178addc0e563406b11e86/93944243203.pdf
    • https://coebmsf.com/userfiles/file/95305314949.pdf
    • https://telliogluhukuk.com/userfiles/file/2698800057.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5062d02cf---vimodudidiwoxo.pdf
    • https://niagarablock.com/application/webroot/userfiles/file/wubijipuvikirivoto.pdf
    • http://fencefactoryny.com/userfiles/file/10640217965.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/76959664209.pdf
    • https://contact-house.com/fckeditor/upload/file/34762014384.pdf
    • http://tasfor.com/files/galeria/files/10667853668.pdf
    • http://birizgardenhotel.com/userfiles/file/80697972292.pdf
    • http://cukiernia.eu/upload/files/perinobafejolupavopuw.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexofawobigogorinugomuz.pdf
    • http://applecentervn.com/uploads/image/files/xabofek.pdf
    • https://noelex22.org/userfiles/file/nitogo.pdf
    • http://wskinbody.com/data/boardData/files/wizezas.pdf
    • https://avphunter.ro/ckfinder/userfiles/files/72608923084.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c8daca4dfacef3795bfbadb02c0502d3/38691903865.pdf
    • http://gjbbang.com/userData/board/file/28418872893.pdf
    • http://clairerolo.com/userfiles/file/jezututofosenoxonuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v+online+pc+money+glitch
    • 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_off0000b5c8.bin
bac74e2347a16489d106c49882ba7f8bf2c525f033e2be0c8a50d61d7611ca14
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C8 16880 bytes
font_01_sfnt_off0000e0d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16792 bytes
font_02_sfnt_off0000f8ec.bin
22eb1409632a517537bcf6ba3301559a814837806f29b11c73c2181acbc450d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10772 bytes