Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e1f16d8231d97e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 04:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b835a21b0f3fa7c87c4bea7de0535078 SHA-1: b2c24f748e81cd8daa49ae8193390e39faffe205 SHA-256: e4e1f16d8231d97e2d1423e043f48eba897a29fba6de1839f89ebb86806f15ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan. Static analysis revealed numerous embedded URLs forming a link farm, many pointing to compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a container for malicious links rather than user-readable content. The presence of a link farm and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zechnerbau.at/images/content/files/temaso.pdf In PDF document text
    • http://inistor.com/ufiles/files/27190855811.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/dodarake.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a30c82fd9570ab9529b85a9560c1eb13/kubuzevuse.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16130c989dc33a---jekojelaf.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/ribunonaguzugi.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/butoriwifafalopon.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/tanumip.pdfIn PDF document text
    • https://activepymes.com/pub/file/75685740776.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/jakagesaluzufukoxiw.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/61707987367.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/28510105194.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/nigiwujoxepivo.pdfIn PDF document text
    • http://mopron.ru/upload/files/pipazerukanugerinup.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/coktgatqrqi20ufpnjgdf0i57i/61351953029.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/gumir.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/82039729532.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/51094752914.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mesixokunipiki.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/27869576803.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/xezuteb.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306995b0f5b---41033141667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+minecraft+game+for+android+and+play+it+freePDF 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 18272 bytes
SHA-256: 5d8de72c5cbc3c3026062bf66cf8d12f7865bd07882c72f719ad166de7f5bd95
font_01_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 10996 bytes
SHA-256: dee16823c1b009ddfda2906596d6e429c6f7d778a07488aa074f86d96edf2d66
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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