Malicious PDF — malware analysis report

Static analysis result for SHA-256 34610669f2983060…

MALICIOUS

PDF

98.7 KB Created: 2021-07-01 15:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b9fd79d14a1ff72d223c8104dd638c3 SHA-1: aeeb64ccb81c475f6da8cd76063aefd5a2927479 SHA-256: 34610669f298306088939a9bdf9fbcac350844f56b3602f2c6e09854acec7ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/aaee5dac01819ce0562b968a52660e91/17413383570.pdf
    • https://bruceleevideos.org/images/file/momimeje.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9fc562ef394b56258d0a8509690b3275/12749168498.pdf
    • https://werbemittelag.ch/upload/file/91879653652.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ecd2323---muzamilowesirezot.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4e6f7747b13d85d0a5576d573d287d5/24964284930.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a3c87de0c4ded737ba4ca84a90764eb5/59310976771.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7d78cc5f8223ffc55e49053d5e91a178/bamav.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dae37a959d1---93025480705.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/bosomobud.pdf
    • https://hondamienbac.vn/userfiles/file/wevedadodaruzejirexefim.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/20e958b8495d89ab5bf90efb30e6b3b3/xivob.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qutac205hq76f505fp4vf3i0qp/74481079965.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a9c8a77fb0a49572022e4bb07df158bc/45146568180.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751cadaf64d---63219806494.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804eea07c7---79676438532.pdf
    • http://madmojo.com/fckupload/file/jezodojitosadevaxukepebop.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086cdcea1d58---99502615856.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2808caf0---16910187105.pdf
    • http://vivaibonomo.it/userfiles/files/13040619167.pdf
    • https://abugfreemind.com/userfiles/file/jebabajegapekasojudiguto.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/90fe7dd1266d52dcc28835acad8efa6b/68987788701.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/efdb3f4febd53ad4b7d86768ac4cfbb2/26857456114.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e12b0ca0---12977305296.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bd63c016---63796321463.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43e285da4306d472feb8ea4af73f218a/fonujovogoxif.pdf
    • http://abogarestudio.com/userfiles/file/55893816579.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/2oc709ha5ekb3u76rjhm11371k/48063715090.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cooking+haddock+fillets+in+oven
    • 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_off00011bf6.bin
9b2651b58c6c5e458def8382b74b30a97a243943d6193d9adf8cae7ed97cfde6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10844 bytes
font_01_sfnt_off000134d4.bin
a03c52c3281fe7160f13f2a5003f9dc6790726210b2a0a62795bf1b5e09a90fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 18624 bytes
font_02_sfnt_off0001653e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1653E 16792 bytes

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