Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13dcd81e602b083…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 16:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f12119958571ffa15de22a6272f60f4f SHA-1: 4b5dbacf65e27718fa9f04bf7cad4794c4c7b372 SHA-256: e13dcd81e602b0838a1804bc09fea96537b67ab9f68dc6ed8a822792c61c489e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://elitvorota.ru/f/file/87247541639.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e83ede7e---mivimepobufu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8717d1933c2d5f5df828135cf5248fd3/61775017333.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ba591287318d177b6df6d0867c119566/tovini.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8004ab31d61cc069bbbf28798030f21d/vigezomagamiviparukokupod.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/44615784495.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/99675794145.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/56968026172.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c61494b15---60291671708.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/42194139776.pdfIn PDF document text
    • https://isleo.com/i_photos/file/57583972342.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d88499444---31503836876.pdfIn PDF document text
    • http://autovoda.ru/upload/files/23881673188.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/3628046241.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a84c1d22---pevozitofoxadexugetugoraf.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/99048183242.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/86862031205.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/73691211742.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/86083888103.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a337b6cbe95---kobimisumojonupav.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0e2fa48a1a3e9c7ebba34832baf0c1bc/liribikudifutekoporu.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/kisawukowuxaw.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/146212ccfb49a7250b61ad16fbcaf789/xizup.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vh7m4qkn37umkf023gkn9hvhu7/51152148508.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/64483539c0ee4f03032282a33639eb5f/lesomube.pdfIn PDF document text
    • http://healthywithhart.com/res/file/35405281369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cryogenic+refrigeration+system+pdfPDF link annotation
    • 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 17780 bytes
SHA-256: 20fe8c81d78b263826ea15007a097a107339c80c7051d56a51f411a1d59b4fd4
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 11064 bytes
SHA-256: 0021f1bd8dd07e19d1300ac3b07943909d2c9457f8077ceab6f8890d51fc770d

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