Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b79b58ef34691fa…

MALICIOUS

PDF

82.8 KB Created: 2021-08-17 20:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 650baaf100ab36648d61e9d8c2dd6379 SHA-1: 9b6d5e202a8b78fe9214a10f66718c0635ef7025 SHA-256: 0b79b58ef34691fa0ec4942aa3ed0f7062fbeb8d1dc0d539cbcf6b0a671dc4fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDF files hosted on potentially compromised or disposable domains. This pattern is commonly used to obscure the ultimate destination of malicious payloads or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=querying+microsoft+sql+server+2016+pdf PDF link annotation
    • http://aqbnb.com/uploadfile/file/85435174562.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/vonidulesobabajojoki.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zizukizedazume.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/01fb8eb20bb316aa4ea4e946858f40a2/39114559720.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/49290457457.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/96132597213.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17c4008727c08ed20fcd32233808680a/61940255980.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a800f3f0590---30544174827.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/zixumevedi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3b3bdf14f59b20288355e1ffdebaab72/4789616205.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/14315838123.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5b2c5f62fe6875babf89d3328f5cb202/77688622725.pdfIn PDF document text
    • https://koratspring.com/upload/file/dubujuzuxo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142a9e3df93---misinogojekifog.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3967d51a---69295133873.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/81727247164.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/85944027539.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4f9188a827ce109624696ca60fb10ac7/34955226844.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/43207437194.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/xobesaxixas.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/mezawutubokovamofik.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 16388 bytes
SHA-256: d7effb74b6035680cba6372b3a08e7e789d43936cd028496e18f36010dc1a097
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 11748 bytes
SHA-256: 61810a8926e06c42d1a58d2662b2b46f354e173bb388ab327a2a04852c5e0a24

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