Malicious PDF — malware analysis report

Static analysis result for SHA-256 62641493264348b4…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 17:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 860874996f6a956521e8d473612deb6b SHA-1: 0a5baa132a5c348f355285a12fe65cdd6aeb8f58 SHA-256: 62641493264348b420f58bf7b7b45910ff3ff5b16687cd197ae40952566bf45f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern designed to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://novehorizonty.sk/userfiles/file/43516775817.pdf In PDF document text
    • http://designbeginnings.com/upload/file/41842118293.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/238ee9abdf7a28dd359c9254bbf03498/jijirivimozuboba.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/gadukerutagazerilim.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160886db878328---25845315581.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09106f9ab---lokejifip.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/70456905175.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d15b1fca551672b9662db2528eaf33a3/32251171355.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/5644730215.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5o79prdvq7cte0dgcs21jsrspm/dujawexed.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/36f3f260cc8f86d66bc959b3f29ad9ea/demuxifixuwisari.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tabazakiwufomemas.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/nuludopedudi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d8c1145a8297a8f1d4494311ea6a6959/71464399215.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/63789544712.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/80512125487.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bi2l3i9q25538iq33qkbufkt16/zokidanutitonofi.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/mizikulozoxujug.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/dbd377eefb35b48704ee3646c1e9a4b3/mabedawoxozezumupa.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/93960357563.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/nekozejudomususogigoromu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c34dbf60f911cf7356d8d24a158f0eb/88251405564.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0d8cf0436fa64d614f0081cec241dab4/bofitekekurimoseranubema.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/korosuzatudejolabifokuk.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/53244150210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+meaning+of+claim+in+englishPDF 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 10676 bytes
SHA-256: 5cdeb1129e167c18765061371205da1592b080e172ace658ca000c2356173799
font_01_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 17172 bytes
SHA-256: 6acb423b25e1f43bf8778ccb03d2d24dab9e62ae180c184e553363285633559b
font_02_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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