Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cacdfdbfefb421b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 15:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd38386e5c52072ec3978c445fb3e2e8 SHA-1: 25958b43840eefd380a3ccd00243891d5e53d2c1 SHA-256: 3cacdfdbfefb421b9f8df658b7394044057aab8813c6382349da5c8b73d5d3a7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to external sites.

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 http://axiomestates.com/userfiles/file/73138004936.pdf
    • http://alpha-th.com/userfiles/file/wisok.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b968ce66a---xazezub.pdf
    • http://topenglish.sk/app/webroot/gallery/files/90698868297.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2ab644f3---41298947280.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607953161c530---jewosewowerotufot.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160973483b12a2---58600835960.pdf
    • http://joesservicecenternj.com/userfiles/files/finawomepemovewijafunojij.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k0h0ikm978tlvd04o4kaqssut0/93359947020.pdf
    • http://daiichibus.vn/uploads/news_file/zabew.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e5dbc100d9ede8b3df75aaff9cd89a7/42641487145.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b0f7ea85---bigirifomasukabaxim.pdf
    • http://mhinflatable.com/upload/file/xutiwimotukezi.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/cq6mdei86atq7a6buhgtp41t4u/52151368337.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ouqdeg5guqlu0u1ksjeo6t547p/43823191702.pdf
    • http://domholidays.com/userfiles/file/71810013137.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e8618fd3.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9ea7a992---33441137959.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3752e91223---60054515734.pdf
    • https://sportnazona.bg/f/uploads/files/jujaretakigodogivon.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-31/20210531043811546541.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78101e56c6---jiverikamugo.pdf
    • http://al-bandak.com/userfiles/file/50400320057.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/setefamesu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=didactic+teaching+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_off0000efbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 16792 bytes
font_01_sfnt_off000107d2.bin
8af397f9016411e47370edc309609eab408576d7cc0b9ce26ed6ea5ee6285b3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 10468 bytes
font_02_sfnt_off00011f4c.bin
6d01d97a30ff028231da7161552c11783da7a5c43e957728b8dbaa34df85cf0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 19024 bytes