Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6afaaa1ece7610…

MALICIOUS

PDF

87.3 KB Created: 2021-08-13 22:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fdf417cde7f6d6b5c4ed8fcac905a55b SHA-1: fbe9995b27c189a853ae9c238ba6e61e4bea0313 SHA-256: 0b6afaaa1ece76107fba0a25ae49178df6545eeb8ff20f356fc15a0efdf4fcfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=peliculas+de+janclon+bandan+completas+en+espa%C3%B1ol+latino PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f980e29a64---59436138674.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/44267289164.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1ad852d4b0c56ff79bbae6157cc55d12/86803088811.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/makowetamawazasovi.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/lukezulunaz.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/36489504774.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/20321777393.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080035c851dc---jafakexonunefaxilinunag.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/nogusifaxilulapikelagadik.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f4f5a9e58242bc2ed50727c4d8b75de3/neziwelisakajusedozax.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/wifotibesaja.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/srv5msabds26igkcfov78siorr/8265775357.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8baf359fb2---jotozexi.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/vupitaxeguzokalofov.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/j6qr3nqr6pvtev4u8ljj10uu00/lololagigan.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/mibivet.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d168c6fdf0172717d02c26550f5576b7/43859722123.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/93048602777.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/dumize.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tavuwegapotadugaduzag.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/sidiredobebaletelel.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/43786bf26c8b1ede83367e80f528ed4a/mofujexogudaxexo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b6c6921a---pelanavojomuzok.pdfIn PDF document text
    • https://shopabrang.com/images/files/buxikajunenalutijinefazew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 21384 bytes
SHA-256: 04e543e1deb018d1f21e29d3e511b0a42063233935d1693cf10807d6dce759f2
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 11152 bytes
SHA-256: b7217c8a2d3b954fd404a3c5c56f964f198f373b9de9e2c1cb47cfc3d3a76206
font_02_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000131fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FE 17636 bytes
SHA-256: db94151d4788123e049f9a9047da2843863e7f6d3163ba5aaed425e25f2de71c