Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f811fa81376b2d0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 04:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a84fe62f9c20bb25d5db2b36099aba85 SHA-1: 6bd0bc7ab13e16759d7085cec995f9c7869f500f SHA-256: 2f811fa81376b2d07d0e4abb05b8920651a9e05b5cf01fc79b78451864443d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier flagging suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic findings strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5932

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://inwebjor.ru/uplcv?utm_term=torah+portion+in+hebrew+with+trope PDF link annotation
    • https://grnca.org/img/files/files/69947957804.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/sobekifumivoxulazizevazan.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/wefirugozafa.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/88591911484.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/77883556301.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/8467960143.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/69213645758.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/jurexe.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/il7l3ecrgar3v0tv4b9b1a7phn/visalozubaxanapedas.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/46580466895.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7baa4278ca014455c6fe336509dc3e5e/kuber.pdfIn PDF document text
    • http://www.heksan.com.pl/file/93080846814.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ec3e5eb8a2953114b95e522aba8f036/96141950097.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5b953ee576854881905501ff6baee8a3/xovomezetifekopesanore.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/achk70j7aruv0ltddnkh9507pq/wekajususis.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/muzekamamuvurerap.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/xomekenuxurenod.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/bmou6s0ks235b5odoghbeidbtp/76175018436.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3e2007630---15699922976.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/dusojeperuvovufavavezilu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cd079472---13888203335.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/19316251693.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/61888533610.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/4159298810.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbdfe2feb---60627112859.pdfIn 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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 19096 bytes
SHA-256: 2163dd95e78c73852566086c27f34fd7fffeac3e9d09ac3e1017ff4eecb600ab
font_01_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10324 bytes
SHA-256: 1f0c0cd0efd1c2289ab459f58f33d5ef3438b0fe27bcbfe819a5cecc9e39840d