Malicious PDF — malware analysis report

Static analysis result for SHA-256 f322692b87660f21…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 10:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7fef64059b20c8c0e777a6edb020017 SHA-1: a02828df82e8c885af37c0418da37a0eceac186d SHA-256: f322692b87660f213ae40a2746a61a58224514cfdb1041e2b6ae728f0c8b2246
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 embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites, leveraging the PDF as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=c%2B%2B+from+control+structures+through+objects PDF link annotation
    • https://xehowo24h.com/images/ckeditor/files/zisazu.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/rakajonibudugosimitoxon.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/naberililimuzaluletaza.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/tademofiliniva.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5e45859367604b6426af11fc816ce420/lumuvewadabijasiwir.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c671d7f1f44---3147698576.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3342fe5c---12907411503.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/42701975194.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/7594837783.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/1rcds78bsnm8a4ec9hij976887/51574200870.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/11821381324.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/26221759437.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/33649309577.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106565b62b3c---90047775858.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/44484628664.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d69c9a1758---85094514883.pdfIn PDF document text
    • http://cycling-software.com/files/file/44970308949.pdfIn PDF document text
    • https://irantruck.ir/data/file/75248853593.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/66cefebb45b76b80683dfcd73383f03f/pudaluduvefapapefurux.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/597edbd7e276102655e81d8f0cd3d181/jogapekekosifobigevanuwu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf93bb5a04---kepasun.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/godasaganorugakuraxejeka.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k0bk065s63olt3tprsvv2b0qd7/51069646146.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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 18848 bytes
SHA-256: 7d2e293960e62a0ca1111e70b550fb9085391065f792adc80d0b9a8b81ab4874
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 10932 bytes
SHA-256: 466eb0f214986830689f0b38ab7300890ff2b390cbe66f87be1ca6b2a93681d5
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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