Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f2222e23750fd0…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 23:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 321c29de82354b5bc6e591e5763147e5 SHA-1: 8dbdf643e15ba82cb27756c16891f26df3cb4325 SHA-256: f4f2222e23750fd0c134b2e441d9981b7acd0134e8881901904ad161322fd912
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites, likely intended to redirect users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://pagyesa.org/userfiles/file/20210620215331.pdf In PDF document text
    • http://pospatrans.cz/UserFiles/File/kutetolu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/pebemazanu.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/5139105282.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xubaju.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/jugedi.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/lereselesabilo.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/aj3jmfsluutclhodjm8uud3hms/26451779705.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/87355880471.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c7ad9054---wiwinifuwugubizajo.pdfIn PDF document text
    • http://etnorom.hu/pictures/74212874109.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a78cad7807680f9d1c788206d139b01d/koperelaladoguwidofozibog.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/17151253983.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abda2965585---79973690995.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/32067875492.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/katuferoxelu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/17947550463.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210618110821_64tjn5.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0f595c662a6881cb026ce886d245a7d7/99379635532.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///bosifumejogowexesizikob.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zibezipiwugazevamosep.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/91724680123.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0575c5b306---3103886248.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/454f39a214115b53388dea1ec3ca386b/54282081290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+do+thank+you+in+sign+languagePDF 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

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_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10812 bytes
SHA-256: b533c29e818e21284a26f47a71f12ce5badb3c976a7cc408cd4c58d0d5a4ba53
font_01_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 17048 bytes
SHA-256: 1aff96e56036b00d4795a0faf432af120259a5b55b9690f35f37a2c0479fc114
font_02_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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