Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d3710cbfdf3f20…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 02:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19c45b89e7a29127c1f3a5d9c5211538 SHA-1: a5a8e32c831f52fa61f2ec097ab5674ec99fac93 SHA-256: 79d3710cbfdf3f205eda7d9fa26ac866c2041d613363066baaa28b7c312c6571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bokavitaniz.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2c8cde681d677bb52313b75ce7b5c35b/99346084171.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/wilavobokuboxapo.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/52183713852.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/11977373405.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/4857538343.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/15900965109.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/zugoxitipemagetevogekota.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e529323d6d89b830356fcc3d9d0a71d8/donexegiki.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/xurax.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/31979102600.pdfIn PDF document text
    • http://panama4d.com/contents/files/likufewalinabo.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/ninogujiziwipaket.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/21386237886.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/durimikuzilowawivaje.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/sekizatesizegupedulalode.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/nijipijegew.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kilusunumaneroku.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/10996234016.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/dabogavugukijixiruzonoti.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/zuvewamopisifosunus.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/3561100688.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/kulimij.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/60113806642.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/vuxukuruk.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11f925ee31f3c2cfcdddf08a9a149207/voresiponakagugujilu.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/70951093928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=repair+corrupted+sd+card+androidPDF link annotation
    • 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_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 10604 bytes
SHA-256: 21df1ccd62e7126fd83479077ddfa207e531fb8cb4b5e37056c89a7e588d1425
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 18004 bytes
SHA-256: c8fd19c8d5c8fea26cec9f4dd1008b2a00e779c1f2d1d1d2026f5ddc9bfe017d
font_02_sfnt_off00012baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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