Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a4015144c2cf54…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 04:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18cdd20684b3f7b7fc487d2ea803dcad SHA-1: f5b5a0b4b62e34f7b44cd4d8fe5dd162ce4b38fd SHA-256: 41a4015144c2cf5448af2ad193e8f20f0e3c843ee03af3e3260770d0345a9dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=snacks+recipes+pdf PDF link annotation
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/zenenavikusof.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ecfcabda---xinaluxegebenefitatol.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/kefafifejegatuke.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160910583df289---51815399193.pdfIn PDF document text
    • http://tayles.com/uploaded/dinefedazaxefa.pdfIn PDF document text
    • https://asi-filter.pl/files/file/zajadilu.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/35b49220b197ef5e94a58ba05b274f4c/kerufumizugususoj.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/81369387075.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210903000911_o4yo3a.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b060d7997e27d6a58f53f9e69f65a731/36877732784.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/m0r4lsafdckpo64fv07qmpav4t/foluponagaxifepejatadipus.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/vefibagat.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/podimi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2bc2cf408---rakerejasapunof.pdfIn PDF document text
    • https://wecareprogram.org/images/file/19925059167.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/jiwaxofiwiwuz.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jq3j4gvonnor7q016plr1bsi77/pexomimizizobedova.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/19644221530.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4866a5f8a1649066ad5c6edc06b29ce1/vetagekevoributuwepabas.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/tutovizekebovuxilokozuw.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xevugit.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/nadusikilipasifizewakadu.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/borebolokud.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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 10516 bytes
SHA-256: e7088e279154dce51f4ff8d60e1fa5ccd6cfa00bf80e02b20a1549f023155739
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 17204 bytes
SHA-256: 60af2eef2c016383f71038944f3f51cd4f351cf3759ecc007d232de812836a55

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