Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8538475f0b2794b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 01:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a7ec55c74d892a42d32992e04013332 SHA-1: 77c4fff695482fbdd986818084d864c0dc33f77a SHA-256: b8538475f0b2794b27131a3febc6555fd30ba69f181d5f6d93c025d204214494
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://gustosandvic.com/ckfinder/userfiles/files/53156215084.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/p0jblqghdnoehk6bcba6rudip7/zokakupum.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/37132396376.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/1686144825.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1ebad4dfbfbf677d018d43fe64ad0198/lolixuzokipajizebu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8494d9e74---sedasusidu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/danefafotasipilidowo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/328d17eb52e6109e6e19d974de6c56c1/fuzirivogurusigite.pdfIn PDF document text
    • http://skisun.it/userfiles/files/18878654662.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/720ed645ed4370b3c23759e932e83b96/6924509265.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7ars9uuhlmic8rnsvqbrpcvviv/25703939118.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609165ce2dc97---47522193422.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/9878507025.pdfIn PDF document text
    • http://myphamasia.net/upload/files/665146831.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/wukasefibototulirapuril.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/fukogiwasipenuvoginikuvix.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/resinaxulegemo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zuzabozukezubixovew.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/71569990777.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/borimoragux.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d518cee9c30---wemusabumatufoviwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cyberpunk+2020+core+rulebook+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 10812 bytes
SHA-256: 3ec09e0a7d5557064d20eae91a7750dd5dd63c4b0534cefc6a5b3dc27a947276
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 18224 bytes
SHA-256: 597ccde57ccfe2986d09a5135d2b6754ede75f2afbc4c48cca4c7c4012c5f334

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