Malicious PDF — malware analysis report

Static analysis result for SHA-256 0555b2362b9010e4…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1805b19c82aad8a8e87239f17a7da8c SHA-1: ed09ee8ac51b251344db6eabe4b92980541467c4 SHA-256: 0555b2362b9010e43f4e481ef54a8ea680382ea227e0109131756ac1e2ab3a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=psychology+of+color+in+architecture+pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/nitipagopabironobumege.pdf
    • http://bijverhoeven.nl/uploads/files/xamajalojefejogaxekuxoje.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/c3joaceuelvvgrvo416rp643ak/73263141816.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160948df12893d---gotug.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/41hg299fr1r0f2f3vn13blke36/47683208931.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/473q6mg723hjuul2frra48877e/mepazevaro.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/rujawatutipeb.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/68106750888.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eee25c15d---75401514341.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/crit7ta5de4o0q00hg61dtcft9/zujamebipolemimedever.pdf
    • https://ddshower.com/ckfinder/userfiles/files/88353322443.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099acc26b9a7---8158869159.pdf
    • http://learningkey.org/userfiles/68547518365.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824da0af436---56453770913.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a21a096be53---bulelilejimuduzepumen.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/574a2dc9ef34a13200ad6934c9593779/90951818599.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/173b488add6a51366b74ed911c4f0d83/24281373965.pdf
    • http://fritz-fahrlaender.ch/download/34096249376.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/jokamuzabigidatawexofare.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/h6486qf0gnu5c1m8sskjeuukue/64495990729.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0db916c96b15498f3e8cd6d2463f7757/mutom.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7ncojau5ntv5fidr1dpet4vns3/funodanewu.pdf
    • http://kompletucetnictvi.cz/files/file/35384246712.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ffc0c7a969c6e047dde25461a0f302c1/tafepakenalirasudali.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3d9a6ef4b5325ae909b5371ba4eac31e/59841805684.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4e3b6d021ee7cbec38762098267d9aea/momosimademimebafibe.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_off0000f0bc.bin
d443b79ea2637af8266d7066a5a72884c60cd0ca31267583f3f2bdb1ba9128fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 11116 bytes
font_01_sfnt_off00010a76.bin
8d0a4119857f4d3c35a093d65ab5d37010eb9344368e065cf70b933ffaaf9cd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 17180 bytes
font_02_sfnt_off00013728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 16792 bytes