Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefc63ce2bfdb7c4…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 13:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ff539eb40feaac2f058662348d389f1 SHA-1: 1f804b0f99401e59d751c170f3c7df5201e93a18 SHA-256: aefc63ce2bfdb7c4506a07270b5c265f1ba9ad02446460328f0e259a626f1cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. Heuristics indicate these links are likely part of a scheme to direct users to compromised websites or disposable hosting. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://allytemp.ru/uplcv?utm_term=kimetsu+no+yaiba+mugen+train+full+movie+english PDF link annotation
    • http://briquettemachinery.com/d/files/gowozebam.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/61173819881.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kimanezonu.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/pipewapud.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/70q53app30jdqh2vopgkogmgav/65819897758.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/xofumefuxovefasumajitaxoz.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/28561217835.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/41660438338.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zisumajetufudugikipur.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/50405427333.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/dvjgvd1ii3svt1roaasmu83i2m/losetazivagufidakak.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/molemabefopepunuruw.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/jamajarasugunorijobunu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/64161468084.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fapiromemididugodoba.pdfIn PDF document text
    • http://kustari.net/userfiles/file/wivotira.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5f3b148e477d96a5aa2e9b7ce227a038/fuzujurejijutex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff43512d6---59152516241.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/75674748039.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/41645083632.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xamugugas.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/buvozewebobebaweba.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa4ec9867---42575882943.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///60521546964.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e3bca216bdcab1311df88fc8982ae3f8/libawedalefinizugedofele.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/61289924846.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/88268975710.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_off0000b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 11072 bytes
SHA-256: 3895c0e510ad9e5ab2db72db681c8613f87dc2e4147900b57e5f47805debac43
font_01_sfnt_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 16612 bytes
SHA-256: 74b029b4c1d58cbd6470078ce7f751b499f9b1ef2c77bf9aef14a871c8a08e67
font_02_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1