Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f3e10b4ac49c9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 03:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48287e5ca068ac1de5beced50002b07c SHA-1: a26d90c0e766cd543ba7fc9ebc732a666ebfb525 SHA-256: 638f3e10b4ac49c943ac36f6cd5e1d3b393886082f04deb345809cc3fb237b2c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=security+analysis+pdf+book PDF link annotation
    • https://calendarsunrooms.com/userfiles/files/zitilebepiwukemeba.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/41294702772.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/4143445276.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/48803147925.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/68803806796.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/38428463930.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/76968842117.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/11903967203.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/punamunudogafomi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16110786b7394a---17234127271.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161186cca880d4---jabetexofokijus.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/pasixuzakebemusugime.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115219a851d7---99220807238.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ff8583057---fexovilarofunawudilosaku.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/11eba5a8b47d9ff695f978289dfd1851/lotaxakedunavume.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/7588533177.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/voliselojujofepow.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/18425768955.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/sapipun.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c78bb1e9---66580895639.pdfIn PDF document text
    • https://blokhol.com/upload/files/99908662920.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5411b72bc41a45f3b257602db1dc3ed4/dawevokarafoxironodotemo.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 11136 bytes
SHA-256: 427d391d6549f9ce6594a08838ab3b9831aebc61dbd1a48a5b553d6f2ca9da2f
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16992 bytes
SHA-256: a1e4b08ff0e3c600274966d1eb4818b64f8b190a8ac592bd4b2010006bc3ccb0
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.