Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b908d5c73a800…

MALICIOUS

PDF

72.1 KB Created: 2021-10-05 01:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 571d928bb56545dccc12f73ed80f5e50 SHA-1: 063ed3b875eaa7cd1dcaf7ac3190af8c0aaaace8 SHA-256: 8b5b908d5c73a8009088f3c6728a868b2decdcae57989ea01e47c4180b774e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=the+most+dangerous+scp PDF link annotation
    • http://itena.si/uporabnik/file/50776214346.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614266aeb6970---somituwejumefapap.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/tegotekobano.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/97859892943.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/48166b09f2013c267e4d877090f5a93e/32512669734.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/16709921048.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gofaxidoxexexipiloliwe.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210904_268EAED6B7DE24F4.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/53182817015.pdfIn PDF document text
    • https://clubon.top/uploads/files/jogubevozib.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/25548905765.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/60996644797.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/53548970152.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/14275533066.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/wogimemalijakazupi.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/sirogikurujifox.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/48832684380.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613535982b856---4113617233.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/purenuxapitatugovekuf.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/85742566762.pdfIn PDF document text
    • https://groupits.cm/uploads/fck/file/5632123401.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/mugugu.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/xuxigepogibavuzibokemumi.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/44065852858.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/29030033110.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/5588327222.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_off0000b7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E1 16456 bytes
SHA-256: f6f70d5913539fcbfec1451a6f84c3d5662fef1e1edb06228a80fee817716cbe
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 10884 bytes
SHA-256: 9152989362f4310441e01e7d22d561303a5343d98d0e3a5278aea2f09522edba
font_02_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1