Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acc48c9689408de…

MALICIOUS

PDF

91.7 KB Created: 2021-08-31 21:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ea5e3eda7ac5f545ed0efd68ddf4fde SHA-1: bf349f1026ffb848d863a01835790a9150aeb07b SHA-256: 1acc48c9689408defa647f8eb5734d1b1b5e9941e8ec27502b5874992645f9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://drafthe.ru/uplcv?utm_term=big+and+rich+still+together PDF link annotation
    • http://suvagcentr.ru/userfiles/files/18668531242.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/23403742225.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/gezisixetasekuzamubezuzo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xalexefawodexukasipoka.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/42187126124.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcf3c7e3f3---95871661126.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/39019770135.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5de906897f42bb53521a9fbff3b3eaaa/luvawufigiwoga.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079720bb60c5---12252294368.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sh43sac8pu5478urfg0uovqmgf/wuzazotokefava.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ea7db0d4---nekevuvip.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db83100ea4e---nemowuwakoxikuvutu.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/mesijedovimosazaroreziweg.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/12291884564.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087182ccfff4---zisepekojuzitodezomezar.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d4cfea702---petogujukivezuviwobixeraz.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/83227989397.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06aa6c463---64422013331.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/484bdd3dbf1bf17877b28334ffbe41e7/modaluvegejesapesolavuka.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pigulaginomoxagenonin.pdfIn PDF document text
    • https://rajakedua.com/contents//files/bivew.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_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 19468 bytes
SHA-256: 723322b78da84a80a8409f2846b9b236359bffea9c26b106b52a07554dff63b8
font_01_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001489b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489B 10704 bytes
SHA-256: 17b9e7b4262fe70b1ca989ac97a26fa86115fb46e9d7f7bc14d4d3ac190e6cfd

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