Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e65838afd4c1a00…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 16:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9279ede2dc6687cb69e427c5aab9f658 SHA-1: 4cfec9e1dbf51b6aa4715683ef65956112ffb921 SHA-256: 3e65838afd4c1a0058df0d970155e1288d4e4891f5469fb76ffd8759ed64360b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://aqs-group.it/userfiles/files/zexixosafakalokevunob.pdf In PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/47228805412.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/lagoturusomomode.pdfIn PDF document text
    • http://nut-shell.net/upload/files/32716116621.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/55800090020.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/zopetopujufoduwupotol.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/nisurameduresexilotur.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115ecf2370---gubipokogabokupubot.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/70969578771.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/nubimovajelavebebar.pdfIn PDF document text
    • https://csn-alliance.com/data/files/mavomulepikavasapo.pdfIn PDF document text
    • http://lactopad.com/uploads/files/23445158831.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/74126226343.pdfIn PDF document text
    • https://sim2007.com/files/68002393878.pdfIn PDF document text
    • http://elitvorota.ru/f/file/90157993012.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/97045516753.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/24797191559.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/85450182658.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613993e99a5d5---gomufemuwifusinedefolu.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/45002826365.pdfIn PDF document text
    • http://patroha.hu/file/sudejutifij.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/pizoxezajulejebab.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/zukupetijinavefutudebiwi.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/48602471304.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/70946400775.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/718705cf59e4555744fe4007f97fda5f/gulorolewag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=monopoly+game+download+apkPDF 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_off0000be01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE01 10560 bytes
SHA-256: 0839369652475536780c6b5faceb8ef924c5ad4b781466687510709481833e76
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 15976 bytes
SHA-256: 55aa7aa5c7fa0c7f843c12e62b58aec225a20b6ec2089f795c6cd9875fd86444

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