Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0099439e7c30284…

MALICIOUS

PDF

95.6 KB Created: 2021-06-27 23:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d79f732d77d61459e09d756ac8b20a24 SHA-1: 6071fc88476de5edcc68114f2279654d40b6f029 SHA-256: a0099439e7c302845491086b151190cca9b98f8f1ef2a03f846a15c4b254ddba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=during+a+period+of+deflation PDF link annotation
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h3q6s2iit88b3qm80k3kv5bcd7/sovixaloru.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14b3df916d770132a12597c453636e9a/96765297070.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160cace79bb999---1811211403.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4b6d360d6e6f2854474521ee3cb65f38/98431704640.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/88020947015.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/av7deh0dui3b42uslva41p8ka7/51580991462.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/80845688212.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160911df29fa52---futideri.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dugaledetowabef.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/75967054877.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/dezixovoraponawufiwex.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/nulesuj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ac68e3ca705415fd5e38ea521df209e7/nikuxalazegesarinu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/baremuropafalisuzaladaj.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a99e0b0ed---42404952410.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f5eb9ce5---63864480288.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037371b549---79861121637.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a5c4a3fd---69950265078.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/napurorave.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d112205a5---65346184972.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7e4c758f---34918937995.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a60885aac1c62c1e414e8f09cf38f95d/41670534433.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65580419315.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

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_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 17264 bytes
SHA-256: 182032860efbd459d8cc4a05c7d8455957c07c3f1d0206c3e2cc0ffcfe696fca
font_01_sfnt_off000140ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15901 10608 bytes
SHA-256: 61405e0872f55c9c4d09d8be4d9fdea818a93265abd84b2e9e3b0fba22f2ec5e

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