Malicious PDF — malware analysis report

Static analysis result for SHA-256 71951e4b37561593…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 16:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 017bd393882c217017ca907b45600e69 SHA-1: 635f3a3d9a4cb0e3011bf4320b7649479b540a28 SHA-256: 71951e4b37561593cacd4728d182210e9677fbe83a179a98e7062ce5245dc230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external links and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=grade+9+science+final+exam+pdf PDF link annotation
    • http://bekkercoon.ru/ckfinder/userfiles/files/rupezewatulinez.pdfIn PDF document text
    • https://dintek.eu/uploads/file/lojuvemaje.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/7615512036.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4abfd53ce17dac32e3dbbec453682c1d/43465346930.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee4e7cc67---41821889280.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210901_47C065A0F81F48D9.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/8914766101.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38d8t0g4ugg2o2tfbotapc6267/71603610375.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/22743260180.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0e1bd0c6b---zanojipodi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609070c4811da---xorovuraxajijik.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2f9b07d2a812e08e96c79885f51cfe70/gugufakiwadusokedef.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/20733851709.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/68580226347.pdfIn PDF document text
    • https://airshow-bg.com/file/14455331902.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0989ba8a63c3b6b20606b546b3d83fea/69112640175.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/97e2fca9f97c91ef2a91bd1d09c66288/guvevovuzinalewad.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/gisadukopujujizefefo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134e16de776e---fidutetumoru.pdfIn PDF document text
    • https://yellowstonewildlife.com/98595082674.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/110bfb58cef0a6f42b724eb51a587658/xixikofod.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/fejutixorimuzogit.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6e7b9401441f04c3273cb9793f9296b/14812314902.pdfIn PDF document text
    • 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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 18100 bytes
SHA-256: 150d33668adc537b7215c2befb818b4e7cc3b35d850c11be66ea5502690e2673
font_01_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 10872 bytes
SHA-256: 8be4206697f2591262d26f41deb7b81e870acf31bf861515395e5025f5d50e2c
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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