Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee81974af6af87a…

MALICIOUS

PDF

91.7 KB Created: 2021-09-17 20:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea33118c6a5dee8423ee6d7b5fc9baa8 SHA-1: f963e524febc3d515966d852ccf71490ce3fbc4c SHA-256: cee81974af6af87ad9e648e6dde0a7c83d068d853eb88b50f60eb8a24fc57e66
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous disposable hosting links and UTM parameters suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pixomot.ru/uplcv?utm_term=indian+android+phone+company PDF link annotation
    • http://siciny.pl/userfiles/file/38681872903.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/47651224008.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/62232855.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/66525163915.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/67ce55d36bqh7unuh8ab1dastt/kigamo.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/42250637460.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/jiketodonerodataroru.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a18b27c38---mozuzet.pdfIn PDF document text
    • http://packamate.com/userfiles/78057362712.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210904_E1BC608C946CA56F.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/dofozefirun.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079ef309d3---45426494615.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/31596378574.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/dupagikopiguxozi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/42934739569.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/nitasutewizuriwutalel.pdfIn PDF document text
    • https://bczenekar.hu/files/file/71644108109.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/sulix.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/vixukuf.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/40480095869.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109059225_494409848.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/65188856331.pdfIn PDF document text
    • https://lapdonline.org/file/6206166221.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 17656 bytes
SHA-256: 1a41802e08ec0f10bb6aade82bd0bca226445d7ea13349eeee1abd25c7b5f012
font_01_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 10532 bytes
SHA-256: fe967dd2ff44e9b686bde550337d007c82c096b7339e4965f21bf7a4e3164036
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14745 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb