Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05271b64c9d14ca…

MALICIOUS

PDF

81.6 KB Created: 2021-06-25 22:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de439ca750f857c8e2316f6bf7727f64 SHA-1: cf93d9afeb14e12b2892a71177773b19acee4fb0 SHA-256: c05271b64c9d14caa2bf4da2cc94091086483c539794163faf8796dab4d45157
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://fonnepal.org/userfiles/file/gepikulibuzologawatakim.pdf
    • https://atcotourismtravel.com/userfiles/file/raxareraforabuteti.pdf
    • https://blugarden.eu/file/zekejibuje.pdf
    • http://weifong.tw/fckimages/file/89701708069.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b4ff98ffe---74885384790.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e34b7990e53df58fcea94e671f76efa5/55231727264.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6427f605680d64d64ee807aeda1be802/rijafutubaj.pdf
    • https://whiteplacard.com/UserFiles/file/sufulevuri.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/31439545179.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9d1ef2a82f70e6b06ad6cd025e140739/24516116836.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/b846dce8184eceb896eaf4a887972b4a/maxewuvuginetakilaxe.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a351275f72e---togurisesepip.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/871n9ld6laihnprehsi09pmr52/voxazalexoninunirag.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/75fe7738cf09c4e647731b8f32e97a97/95679835536.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f028b43419---63077478507.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a68c6e5644f---zukinoxipogosudusedusopo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752b2bce5f9---wukalajepanib.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/20bb10aeb839c91e8e9544a9a56aa5a9/88658824847.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074258487acc---vejixefuvosokutez.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/66072203479.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba4e34412---burizalowuvula.pdf
    • http://mobilesamara.com/img/files/file/rarojesitabegewu.pdf
    • https://nepalaviationmuseum.com/userfiles/files/58162834369.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pretpv9gmtbkfeiarhn1duu9o4/sotonaduwodutija.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=whooping+cough+prognosis
    • 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_off0000df23.bin
c2f8b2eca428fe3026dc9f2794170ef4a52c58d506cbf0fd6693994c13f9a13d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16500 bytes
font_01_sfnt_off00010a09.bin
0929434a152be502e9adae92b35921799264009e72a67f3c9878b7597cbcc998
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10308 bytes
font_02_sfnt_off00012133.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 16792 bytes