Malicious PDF — malware analysis report

Static analysis result for SHA-256 04843f24f8af88da…

MALICIOUS

PDF

84.6 KB Created: 2021-08-30 17:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a2709b9b360cf5d30c396a0a6bcb986 SHA-1: d1497041650152bbff65cc687264c5b5d294a31a SHA-256: 04843f24f8af88da18a2168146b35d346818ef0483e391b2e6f312fbb10494de
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including malformed streams and a link farm pointing to compromised websites, suggesting it's part of a phishing or malware distribution campaign. The embedded URLs and the heuristic firings indicate an attempt to redirect users to potentially malicious content, likely disguised as a movie download. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9014

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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
  • 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://pistant.ru/uplcv?utm_term=project+power+movie+free PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6903fecdd7---15978078858.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cc2bfe5a91fadb202a71a60dadea891d/tekofopuxekigoperotefeba.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/77777409695.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/45631227007.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8d8a7398d01348513572852bb21050bf/konusulizobevufel.pdfIn PDF document text
    • http://vhshf.de/File/20513415087.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/91788245403.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/mivirujezuko.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/36927219647.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7a3ac3f5---93647034096.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210730_B95562CA3A8DB2D1.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8ab9c9c2e271e0856229975debcea28f/xokerunijijule.pdfIn PDF document text
    • http://gibisch.com/files/files/maxovisawonuj.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/gosokalarolej.pdfIn PDF document text
    • http://groupkaishan.com/d/files/42705862481.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896fce7983---78432443395.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125ede750944---9588983723.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nabowaruru.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2d1d1adbabcbf76c7557c07b454cffa1/49152399441.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7ca9c6d2---95031655664.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2275b29605a42305fbd200f5d77a35b8/72553339920.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/38653459060.pdfIn 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_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 17908 bytes
SHA-256: 4907cced7d083f3180dd99aa0b3e4e202c3f69f1319c60a924a0623ab12c1dde
font_01_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 10444 bytes
SHA-256: 4b48c5988c583222a2b52b991cd5bd10d29fb5cb58828abf17a8a439c394c90e
font_02_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1