Malicious PDF — malware analysis report

Static analysis result for SHA-256 f309a86017e751eb…

MALICIOUS

PDF

111.7 KB Created: 2021-05-07 07:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f435164d7d0c6bfcf32ee9bc708dab3 SHA-1: 2e4b6238acc46cff70ffad1d3de8093d828a106b SHA-256: f309a86017e751eb9bf89afc3edf67681f603141d7604f584508b1b8f14c51ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malware or phishing content. The embedded URLs and the nature of the heuristics indicate a lure for users to download or access malicious files, likely disguised as software updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7271

Heuristics 5

  • 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
  • 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 http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcf094841b---14462265833.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2ubvpn31q2l7q07fvkcuhic73f/fujaxisukupakoragaza.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084071e1c5cb---95005809102.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/03fae6pcqr0g0j34gb4qmpcj2f/sabap.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/e4uh7dv6ip2jd0c6lmm1si9efg/vamoroxosalotaditaroma.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ee2c59f84a37e99404d528b42c6874cb/96097765459.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3f15afa012e30cbb9b55094f972e2ce9/tufodapa.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/401a4c485d3ac41b7bafa3656aef0f54/nowona.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2fc7eb9b---roduxutepawezazas.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8127a38d---3083422684.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607443e5e0c6d---34189410351.pdf
    • http://agiusfuneraldirectors.com/files/file/18819271534.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb01a39026---15021576664.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ad6c36bf9bab2d566534bdb334a3ef01/romifomuxagukuki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=driver+update+software+free++windows+10
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183dc.bin
eb1f7633c0faa09b93b57275d2bcf6208e2b37b19182684032600c2917f5cdd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183DC 5228 bytes
font_01_sfnt_off000195d1.bin
e26ae7eb5e93b682c83ae6f139448bf03f66ff5de15eb70b80521cd7c929fcdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195D1 11268 bytes

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