Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb4117d78c76085…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 02:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77082155b5ea3b18f33204e4782fa88b SHA-1: e6023b64e92d6832b49ff58bd95d404135fe1481 SHA-256: 3fb4117d78c76085cfd773fd63f7c1dc607a82d0e83a5109d247860840534f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, suggesting a phishing or malware distribution scheme. The file's structure and numerous external links indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cructi.ru/uplcv?utm_term=revelation+song+chords+pdf+c PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/q92scttbb2d7ttggbipgudp1mp/75088043186.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/gokidoxutoxomigidu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98dd5f42b---14668352242.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/voworapilo.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210826053218.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51b5dc3aa---93542398436.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863c479969---369531064.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvbbphbdvp9lbdd1mv5191nu91/49152182710.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/perisuvukipadexinatezesit.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1cef9cd22a660950dffefdb2dd86e319/29395379347.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/30979525678.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pagememe.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/wopetofavutigugene.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c69f7a77a1bfdbaeac6946f0368ed67/rewawavapi.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216181641161092.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/lekojel.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/95461062798.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hkrbm9o99eml7nj7kepnbgll1j/vadesuwuvupej.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/82389764604.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/xekojejiluxufanuxunowo.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/gazemedixo.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/27800344551.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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 17592 bytes
SHA-256: 5f9886c3e38b926024c22ed7a8a0fde8e43cf7762e573a2a4d1f98ebf9361019
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 11008 bytes
SHA-256: aa33ec3ac8de893dd65046a2fbdc003e411a94bdb3cb5a3bffc8a9af4bb8bafa

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