Malicious PDF — malware analysis report

Static analysis result for SHA-256 198ade4425f78ca3…

MALICIOUS

PDF

72.7 KB Created: 2021-08-27 22:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdfad51dbd8be82aa99eabca538d0a2a SHA-1: 50e499f76296d93bd6295c2855965c4f79eb8b18 SHA-256: 198ade4425f78ca389c6f8914265954371df1e7feaa9bdee93cc6aa8c4cd4d01
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. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external URIs and link farms strongly implies the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=100+ounces+of+water+in+litres
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160902a125d22f---numopatu.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949156bad5f---pigunojimimegomepirogofu.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbd76981---rivopitase.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/12e6509fc995e6ada154b8eee9df8779/98663774791.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ab8d71d92---91243708141.pdf
    • http://al-bandak.com/userfiles/file/41174753235.pdf
    • https://luminex.pl/upload/file/beketukesadas.pdf
    • https://africanresearchcenter.com/userfiles/file/21852638011.pdf
    • http://daydala.com/userfiles/file/zoderekexeluj.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5k20erq9kd9jo3rfqvml0oigo7/pugugi.pdf
    • http://ilovechardonnayhills.com/userimages/doloj.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf53f86126---85977066162.pdf
    • https://nwdglobal.com/ckfinder/userfiles/files/45458330707.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b95577cb820---fafixudomeresivalarajagi.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/9506551617.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb4c2c17fa---69877371277.pdf
    • https://gabconstruction.com/ckfinder/userfiles/files/1120423284.pdf
    • http://artgraf24.pl/userfiles/file/jelukudedasidudav.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/eb016adcb318ce6dec99d1a90ff70145/67484005861.pdf
    • http://weifong.tw/fckimages/file/zofofejufurikulati.pdf
    • http://hzbmsj.com/images/upload/File/zabijemekudiwewuvi.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/t666ob8testvk8jh75h51t033c/12832644160.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3ce1083d---8133918329.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 16792 bytes
font_01_sfnt_off0000d5bb.bin
af24a16884ccb43e1313dea4a8d592eabb017105f0c4449596d26dd484cd91d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 15356 bytes
font_02_sfnt_off0000fcf4.bin
7677c31fc8d29f274d98e67309f30b1c6b62a655083f81a2e785accae9a94ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 10592 bytes