Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3b87c82ec27455…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 05:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 903cd6d577b8cc2b521b79782f376937 SHA-1: 963eb804f8c90c0f9b3db0711c8e53478c7980bd SHA-256: 1f3b87c82ec27455343919cf42dffbbe17749cd56cc8e62fe77a25948a20acca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/e8b2af021d4245245d0ced975289b519/dizovuvozusinefasefarisa.pdf In PDF document text
    • https://bacninhonline.com/webroot/img/files/ponalulelugoxogusabakaf.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/66667283048.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/biluvunojazunakimaporox.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/xilixixifaritimixaxa.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/21a2c82f1230184e9444e988a8aece04/93793244836.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b223b34ce6b---tifixejubobubobefe.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/luworinugojabitavuba.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7331d9226c---80634521420.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/nudigupewisubidaviz.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/4847726018.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8cf51fd5015dd9061c5159365b47ba21/26122657000.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/10797403967.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/dekonuw.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ceb4f4ec021ce0e827c71942904ac1a0/51791445132.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e9414437---tusirikigesalu.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/70192273507.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/18206555760.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tifikerafu.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/47954323087.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/98316032702.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zepomodexajekuwu.pdfIn PDF document text
    • http://didopack.com/files/wazemidusivik.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a394f224898---darigidufixidowamusufivuv.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/19036283303.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/10261732990.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/39771197715e732a3862c7eaa9d3715a/60781615071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=akin+criteria+pdfPDF 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_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 18820 bytes
SHA-256: 2a492728acb3a6e1a303361250be8912e97817ed7dfa0c168e7bc993bea084ad
font_01_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 10352 bytes
SHA-256: fba07cf666ae52d985ca8ad979836461d48e9c4fa13eee4d79bc5b9566d87e4a
font_02_sfnt_off00014810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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