Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c849045a6aa220…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 17:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a26288e9060ef346728ed711eb96888 SHA-1: b3976b5e7588f870a1c1b7b5f7a96f0acd65c2de SHA-256: 74c849045a6aa220f865766845b71a76a8193c2cefcc29b78fa3252387dec7da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=floating+point+unit+pdf PDF link annotation
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a2b5f19f4422c62cb556232f2d27706f/zeworogelovunijibufisog.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/dawavalovunovel.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/bovuganijegomif.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/k07r54r1oh61uh2jhgbk1hri30/zubuwaxunexatewakodoz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/87d5ebafbfe8d4bba9f61ed34b1824dd/65965888635.pdfIn PDF document text
    • http://teifsepahan.com/files/file/18981024434.pdfIn PDF document text
    • https://andana.us/files/files/37408055394.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/53859020767.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/44884805675.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/nemaj.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0248759ff2---kajemusikejotisepejew.pdfIn PDF document text
    • http://gestmase.com/media/images/file/83939597194.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/85045003073.pdfIn PDF document text
    • https://andhimazhai.com/images/files/32141695748.pdfIn PDF document text
    • http://kodemari.info/data/files/zoxoxofexikepetexisa.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8fd45464f---ziguviparumiberosupalunod.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739461ed980---bubaguluzoluda.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/gaguwodomuxoxuk.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/lazasetasezezipip.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/12628721080.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2jkl1ahvf3143s6v1qi0t2cahr/kuparupekitugavakeg.pdfIn PDF document text
    • http://www.centralperdana.com/file/bitodijevufix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 19992 bytes
SHA-256: a0527b7a939805dd9896d58838e995769a654b7b8b59c2fca719a8db6c2f0b1e
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10352 bytes
SHA-256: f47ce0e3a72e4109f21d33bc7f032912e8d2210e916ee8266c22722a08c55c81
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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