Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5cb00cfd6aa229…

MALICIOUS

PDF

90.7 KB Created: 2021-07-15 17:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 971ef4a9a10522118b60740de2d23d08 SHA-1: ed11c3cedc76fe12d4415cdfaa41d538c04347af SHA-256: 4c5cb00cfd6aa229e8998cc7bbb1e0948fba634b7ac965749a065b41d1a702ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=youth+alpha+course+manual
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d900559564c---sifafaxugilodeliludokew.pdf
    • https://przyklejki.pl/userfiles/83276927945.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/abo06chqet8g6iiatk354bqv06/fukegavikolukemela.pdf
    • http://lookkorea.net/userfiles/file/dozejunapajusilejugowalu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sifcku4kggue3mr6tffh8vc5b5/48191805087.pdf
    • http://fzsvybbs.at/userfiles/file/jodutixu.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9e7fb03fa9f57b28c2fe81116b1e73c1/79652211515.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32541f4e3---48054879882.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/l8h30f8fg2u18agp5t5lfptsjf/zuxajosoruvigagulugaw.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab211dbaf82---6874876395.pdf
    • http://nhactheducthammy.com/upload/files/66331168958.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a6311ffb---nobulavab.pdf
    • http://growlink.biz/userfiles/file/wokovepi.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1h54fe63fc45uhhu4gg8ad9k8/xalewidakewozet.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/986b54fa239033428423c6bf1c03e4a4/760001442.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/oh368u0fdhep55n5t0b2ipv46r/74638574119.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c23a19d4---8563878016.pdf
    • https://pasarantogel.com/contents//files/8826597184.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fe1d823b0e3623dcb9c5b7236226370b/bubimolodi.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/iot1f7dq47qrit5c6c0l4bqaeb/makeragumaxoriwebad.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/pubimo.pdf
    • http://temple.mo/userfiles/file/jupofuniresexenowetulaga.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f40be86bb---44367143455.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be8da5ce801---kuxotidadiv.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_off0000fd93.bin
eab6d651c133e1197b45170c3e257f1ce57b9a06bcd1390923be9063af5ae5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10632 bytes
font_01_sfnt_off000115ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 16792 bytes
font_02_sfnt_off00012de0.bin
f45131f9c64d730b495fc1af1777086e9db3fa3a8631c17202bf17b3d9676441
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 17612 bytes