Malicious PDF — malware analysis report

Static analysis result for SHA-256 085a81163044e5e1…

MALICIOUS

PDF

85.1 KB Created: 2021-07-30 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fc9c736c5490ecd9d8f71c566d54bca SHA-1: 3d7557c3b563e87ba773c564af289e3264cd3206 SHA-256: 085a81163044e5e1d31f8aa618706312dbd4ee36213dd1c8664505c8146e58c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and the nature of the URLs indicate a tactic to manipulate search engine rankings or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://tpk-m.ru/files/file/gipisofifoxasabokax.pdf In PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcd9d6a525---89616156703.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e55061d8a---44233054170.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f13dd33bdbec7da78f2fcfa71049fa67/32517543861.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zixevovomavuzedejexiv.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/16915275170.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mfohcaf6bkpcudmccg87k1di2p/54739856046.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/5796699513.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/54418296724.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/619cu6a3mm8i1bofn119rikdo0/88747209374.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4f05a51a6836cd6ac6c79eecc9f9eae1/dukal.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/mibizilava.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8c572b99797ace49b48be8df18c18827/36879128744.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/cb0b6654716137274203d1456883f87a/gatedefegigusoref.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/85089918956.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/pobazugibemupipufenaz.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/23595566164.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca1098325---dumuvexebovadep.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/18202825322.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16094147709179---57850707044.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb5d0ed52---wegezaw.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/evkit923u6c1rqsr4d3cli7tg0/49672077257.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/63404658215.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/zasinuzapukijuden.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160974f590b2a7---kezejomagibamawetoboporel.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e46386b60---figaxixaxuxikavelatubule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=daniels+y+worthingham.+t%C3%A9cnicas+de+balance+muscularPDF 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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 11476 bytes
SHA-256: ad22cdf0424052de39c290d516eaf2abcda045adfdeb8da1ddcc1f9e309f0ac7
font_02_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 18964 bytes
SHA-256: 245cb470b8108d38bf35578c9aae2e47df4694f7819c28ce9b8f6d104cd7f0b8

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