Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00f9038b87a673a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 02:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3aa827184cfb39f2325f44535a92bb77 SHA-1: 94b93bfd42a9ce01a2ac147598aa3df6927fcfc8 SHA-256: f00f9038b87a673a34e2ba030de9e4f89d52e3a3c7fa325a6289b81a91a3eeda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged the PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=emotional+intelligence+and+interpersonal+skills+pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec81b58e8---xagukipewavofuvodekuzape.pdf
    • http://aaaexpressheating.com/userfiles/file/86284430527.pdf
    • https://vestol.bg/files/file/pexapo.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c0d8e2cd6163338c527a1a0ff218a751/76831312618.pdf
    • http://abwgulfport.com/uploads/files/81574598383.pdf
    • https://mszukam.pl/dat//file/68048582313.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bc100374a---tinufugefodovob.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/52105155767.pdf
    • http://www.asslar.de/downloads/zaroroji.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e472e6314c0eb9a3215c0d4b77f3e9dc/posapemepegasi.pdf
    • http://colorfusion.us/admin/images/file/zugilaxavix.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/duzoweketadil.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/xorotatogilipumazakem.pdf
    • https://badrivishal.com/media/14151665255.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b554a9eb9---kadironu.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/au19i75akat2daig36391mud1f/26649125667.pdf
    • https://alsultantrading.ae/userfiles/files/65296635084.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8f22873a682297e5fdc19aa5d3e0917/xakedatudomeputowi.pdf
    • http://nfc.soo.jp/file/17377697802.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30cd8e89c5---73384091665.pdf
    • https://hometutorsdelhi.com/userfiles/files/zujosagesobavojipaf.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c1f0e1b7dd72ca9bfe5ebed26e94116/36980204143.pdf
    • 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_off0000d187.bin
cf2db710ccc7afcb73f96e4bfab1964507eedbf2ffc8430e5e666e49e3136698
pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 17724 bytes
font_01_sfnt_off0000fe5a.bin
ee0b3e9f6b276e8a44e01a45e5a7f536a2e2c3db33920e3629007ef4647fe33b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 11036 bytes
font_02_sfnt_off000117c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16792 bytes