Malicious PDF — malware analysis report

Static analysis result for SHA-256 c879df7c5538162f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 20:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d309b694fd31230d45b21f040b9ced5e SHA-1: 64755a077b144f3e5ab68297bfb5a86784d71692 SHA-256: c879df7c5538162f0eee3cf8623e38a01803961e7759d574c1a09b490bc8273b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://irlanc.ru/uplcv?utm_term=monster+manual+2+pdf PDF link annotation
    • https://amatnieks.com/pictures/image/3329147683.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/83605559530.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0768bf4bb---boduzaloxasu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/01cb848e6512fe72083b4a67d30fa192/vodimozukopaj.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/17915486094.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/raraniwinaxoxof.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/85891409495.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/50676348809.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/25457958427.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/bixiwamifolupev.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/86944844954.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/50594896706.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6eb508c5719ea09abfd9ebbd33d13ce0/jefisuvobizupelimu.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/baboludi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613389ec6c26c---56563537255.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/48304930127.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/25037676250.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/83806979983.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3dd77a5b---11434522364.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0931e9fa---kozezalapida.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/9633580255.pdfIn PDF document text
    • http://metabolit.ru/files/file/malawi.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/43618720627.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/pobagegokovov.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99d2def63---68939707645.pdfIn PDF document text
    • http://fpole.ru/sadm_files/sudetegupa.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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10780 bytes
SHA-256: 2814ba60a002b880c2a0afa34dde15a24c0efec69afbe69ec4449b860c4d0268
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 18584 bytes
SHA-256: 3f6e2c0141762cc630888060b9d9a2ca1992e78fb41408dbbd37c628ac580d7d

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