Malicious PDF — malware analysis report

Static analysis result for SHA-256 8207c72adf9b7390…

MALICIOUS

PDF

110.6 KB Created: 2021-07-31 09:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e67a97a15a4b9aef6a9f785d15c183b6 SHA-1: 31a468cc873dd8332230b3ee73d0fb33967acc0d SHA-256: 8207c72adf9b7390ac40d514328f8f5ed3282bb33c6efc653089ad9c3f9408e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://agroanaliz.by/upload/editor/files/nilurirituzepudojad.pdf
    • http://lighthouse-connection.at/myPix/file/54194295820.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o0mj41r8q4pttejk2nahvaoqg3/91770228218.pdf
    • http://12shio5.com/contents//files/72942488094.pdf
    • http://abwmercury.com/uploads/files/nusazimikinubaferupe.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/91103895803.pdf
    • http://actlogistic.vn/upload/editor/files/62502790836.pdf
    • http://beiwendq.com//data/attachment/file/rigugogelolamememetevo.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1627e4c098a2586e58709392d7a18add/wotiwu.pdf
    • https://aimhc.com/userfiles/file/mifonesobanekigewumibuj.pdf
    • http://www.asslar.de/downloads/futomulowuxanutore.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210725134622.pdf
    • https://megalightgroup.lv/uploads/files/sevusixutavewow.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e59bca9132---46965495005.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d012e115d98---38367177908.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160763fa17a570---mojeteperapururufikere.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/615916bc299464ce4ab2098c25afad3c/51188656412.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/fafokenom.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c24329ce---84453619613.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/sefisosozapefesolu.pdf
    • http://lev-steklo.ru/userfiles/file/35825134132.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mt5bc08300keth0s0j6dkrhhs/bumud.pdf
    • http://www.polni.si/Images/files/jonaxa.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68ea617f0---10536737255.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ratzinger+introduction+to+christianity+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_off00014c1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1A 16792 bytes
font_01_sfnt_off0001642c.bin
e0062f37eac49b4a6f5549608698b63fa067c3b371dc379882b54ebf99aab36c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1642C 18016 bytes
font_02_sfnt_off00019273.bin
c6601679609b2aea921dbba849b658ec9522adcb0d939a806352a6d1ca52cc1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x19273 11172 bytes