Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86e1375293113ea…

MALICIOUS

PDF

93.9 KB Created: 2021-08-10 07:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 5884a8abf5a8fdce6c22b3e38e378ec0 SHA-1: f6c3f24fb60de53ca5f64b0f843ed85045190906 SHA-256: b86e1375293113ea4e87c511429ec0e43c27da1181875a9a9bf20013cc9c9d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The PDF itself appears to be generated by wkhtmltopdf, and while no scripts were explicitly extracted, the nature of the URLs and the detection indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g2m2urav5dimi9p4b8r83lb9f2/56882898386.pdf In PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f711704b82---mojufuwijakobodekeg.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/12498719993.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/437d7d739196e666d2d8e9f3d27d14d3/17490688289.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/618o729gauvp6onhqi5jr94fv4/vinoz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0364c9055---zunolojofow.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/6594751746.pdfIn PDF document text
    • http://airsoft1.ro/files/file/71047629386.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f5d8f1f24509e560535ff69b0527554b/32519527504.pdfIn PDF document text
    • http://dzbnf.com/upload/file///332938213.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/0bc1fe7b022591280265bb3e7ca1ac17/10628418341.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/sadet.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/26089030174.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/pokulelenuravu.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/datusejis.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ee0d979d6ec2b6f8d9990b084bc48251/23237623192.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/kebuxalaxagowilagepipeba.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608782bc93299---dilizadepokejuvosegowuxa.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/37414334883.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/oat7bnl4pq3h7nndh63a1q3v10/25434626152.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/koboz.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/97389434581.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160985f6a774e1---60566662604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+install+dstv+now+on+panasonic+smart+tvPDF 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_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 17808 bytes
SHA-256: d651ae45f2cd34a5880f512977b2df7f763c8710dbad9a6d439231a8c469ff92
font_01_sfnt_off000138be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D5 10684 bytes
SHA-256: 78b363834eeba662c70826c227ff8b5e145d4644c5b939c2b2a0b25df5c8b53e

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