Malicious PDF — malware analysis report

Static analysis result for SHA-256 a367de7ffb406e00…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 01:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c7d92057cc8d3ed039e9f30003c4f28 SHA-1: 76101bf030c6e7a381302804ad4caf490ebb1828 SHA-256: a367de7ffb406e004a004ea1744c28024f4ac223bf04c29d57b16d2cc595a39c
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 a ClamAV detection for a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kondicionery-lubertsy.ru/upload_picture/file/46943026028.pdf In PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/96494438552.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/63ea42f0b87974b15583f39db8eeb7c7/pekadulesoguzasile.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/mefobetotevazuvewevakizid.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/26c2e842a3d52aab2671db38542208ce/deroluku.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/xepasakofuforibaduremef.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/28036821787.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/dfcd971e811533cf1b43c022591ca75f/17426918327.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wobosavulanoxerewu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b485c1b6180---moredanane.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/36425649745.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/57503378164.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/41495634792.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/topirataxomilawomamoke.pdfIn PDF document text
    • https://defaico.com/d/files/22986047975.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/96070791976.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ktq6skjbmbrlm07v6mv6vph5fl/lamipimavunazomude.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/83619308382.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/3214643598.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a919b28f9d0---xodapokatipabe.pdfIn PDF document text
    • http://poiskvod.ru/images/file/2609301716.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/senizafo.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/xanododurusutopita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=research+methodology+pdf+notes+in+urduPDF 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_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 17568 bytes
SHA-256: a9f2917b13191674903b57df692b6793d9e39e63b3aab37dee792fc451351236
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 11324 bytes
SHA-256: adaf70049e6b7b40cb25380c125d26ba3da2439ed8614faf9517176539d58818
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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