Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf3811a1adaaf52…

MALICIOUS

PDF

80.3 KB Created: 2021-06-26 11:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a64e0eed9d810222794ce27c08434b79 SHA-1: d195797a53d45ca99a8b33bd6090d68120062b12 SHA-256: fdf3811a1adaaf52b42c06b82b052378a5590e6a0052a38513b30047dd3fd185
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=foods+that+provide+magnesium
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/87377b6ac3478c6918a8a16a88b66a4b/31166914777.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094adf504240---sozimozenu.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/94fa7df3f34330c78daea08ec12f9a79/9431254981.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccaf5d600d---58265576068.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//goserijakuzetarub.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/34327285495.pdf
    • http://zwickerfoto.hu/_user/file/bevubukolagipugonotibigit.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/23415938076.pdf
    • https://ludifrance.fr/userfiles/file/dugute.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852ee645bc9---40113226468.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e0aafebec6dac6c3e65a4b5f58fb1d98/3965366800.pdf
    • http://campbellelectronics.com/uploads/tinifofomalikumeririx.pdf
    • https://led7.ru/file/25654179841.pdf
    • http://lblussana.it/images/file/suwazoveroxupoxafakagak.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vq8r231tt4j4k57819rloncmq6/57373513197.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717ca58b202---15154190907.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/smr8ms0kiop9oij0i22qhtbvds/1808152342.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e3e813a763b06624f4b9c727b697c69b/jibasebotenoniba.pdf
    • http://hawks79.com/clients/85064/File/93362286073.pdf
    • http://atya.eu/files/file/wozosunuzus.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/82619b5c871e7198836db60c75cae481/gavuzoperutofoviw.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c2ad2cc2---pilubojogurus.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/658142c91270fb5a9008c7ef40b6bf6d/xuzigujamu.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710b865daaf---pefezanukajitumusumidu.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_off0000d67d.bin
9894d608525109446abcb2c2023cd27e8ad57ca4909fa678de9f7b99cc9f0719
pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 17104 bytes
font_01_sfnt_off000102f5.bin
b84ef81cd97035e30b5289c536e2a3cb0631dae39db910106fdb0615f6c3002d
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 10936 bytes
font_02_sfnt_off00011bf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes