Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0cf14a5d2a03ea…

MALICIOUS

PDF

79.4 KB Created: 2021-06-27 18:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa22d4ce1a2b5fcba67316bb97dade2b SHA-1: b835ad5d296eb688079ae2d4947d5eb6c063b090 SHA-256: db0cf14a5d2a03ea63601180b15aae4d162ad81d7e5ea71c77c450c3d2414364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cargotavio.ru/files/file/kisexik.pdf
    • http://www.thaiboat.net/image/upload/File/2064819667.pdf
    • https://secolink.sk/userfiles/file/nugogilukitobesib.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fd35200f55140c6c55c37ef37338d2fa/tekinapepawinijexo.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/32cd171ccc0d334c3b2e50ddbf389816/74042685913.pdf
    • http://aelma.com/sites/default/userfiles/file/59679653708.pdf
    • http://mosjob.ru/images/file/26286820575.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607910b434831---rumexunaj.pdf
    • http://karthikeyanjayaram.com/userfiles/file/26904887823.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/do6hfclmudfc6itu0asos5bctr/40175030322.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e13a4ad5---77087586832.pdf
    • http://rentbucharest.net/images/userfiles/14022992852.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ns9isahcsfmk6hns42u3ob56jr/perevagipijulujezu.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0v4fmbhd9vid56q83osh7dr43/zupujatev.pdf
    • http://zaun-produzent.de/userfiles/file/nuvaw.pdf
    • http://ccswcd.com/userfiles/file/51270184231.pdf
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/bifotupizigo.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8331a70305---rivelurepexuza.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/kavulojifexe.pdf
    • http://amoy-art.com/Upload/file/56391048364.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f25bde82---38306888267.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/tonobubef.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/an1q2gingg0cpep9h0eulubkq9/22481402992.pdf
    • http://amadpich.com/userfiles/file/15425810208.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+eat+fried+worms+book+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_off0000d24a.bin
b68aafc237b0493f234f6ef875dee4fbff3f96a470b3da22cf16fb306d5e7e25
pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 17268 bytes
font_01_sfnt_off0000ffa9.bin
5ca7fea404ceaa57c47d34dbd6157e39d06c4c107b580777096b0ed40ec0fb48
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10816 bytes
font_02_sfnt_off00011879.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes