Malicious PDF — malware analysis report

Static analysis result for SHA-256 1025c33b178b9d7c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 06:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cc048425b057d79286b5d04ed9f2a34 SHA-1: cf5978fd8e33ca3c96baf97f651551d047c9b5e2 SHA-256: 1025c33b178b9d7cf16cdf3f2c4baf2e3e206edfa855fb482980e7c6bf0a0ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to lead users to malicious external sites, likely for phishing or further malware delivery.

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 https://wastran.ru/uplcv?utm_term=convertisseur+de+fichier+pdf+en+odt+gratuit PDF link annotation
    • http://moscowfashion.net/content/xuploadimages/file/15310491782.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/72243236431.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/gogepuweje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3e21d769---96983673921.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vom12eg1p2nv8skq27ga535l5n/xatedipupigodunuzif.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c0229b0f---63783427233.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/79499106438.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/22416801926.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e63e593f1b9a51d8e0d4932572dc4dfd/redawotafimuduwa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/81a6ca7aecadbdfbe17e63dd0e6ee159/nibemijabusivalifopupapub.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/52560550556.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610902ad44e17---rinanokalimitijukigegalex.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774775c9100---dadumejuxibolofedipefusel.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jenimubatesipunal.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/sifuxusemotijaxam.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sopufe.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/kujukejafuboxosetawisu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/t3t39stp9ejd6p008faufr0ut5/62576579631.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/makepaxejinemegub.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/39507506107.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/gawilodidirip.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/93238969635.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tawuviluvopan.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ajtslmngtum9g5a7g3vh9i2ci4/31620740993.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/zixoxev.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_off0000c156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC156 11048 bytes
SHA-256: 4c94b5357ec15a9365cb83073cbb96ec34eee73e13e32ef999864aace3c6b9be
font_01_sfnt_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 17908 bytes
SHA-256: 6c754ce27d39e18af1c0d79960ccce6b9f7a7bee61fa71840b33aad9b54880bf

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