Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3fa07c08505d37…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c96f24ebd07dc223608075f9d0a5a1dc SHA-1: db8dcaeca2650046fd725109993ec8595cae98e6 SHA-256: ee3fa07c08505d373fe7223cc7e49062ba6f92b75dcd0cefed8a865c72e8950c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious domains. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://k1a.ru/images/files/file/65758812225.pdf In PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/14355813881.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3db3c20c39f75eb026bb4f2c9e2ded7c/98258514168.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/givebamovinofarujaka.pdfIn PDF document text
    • https://chptravel.ir/data/file/lijor.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vasab22nejq15upjfhjfdc68h7/bijasokutovozunoxezepu.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/42069248599.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/gaxopewiw.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/bakiwo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094918536bce---71770907763.pdfIn PDF document text
    • http://tercovci.cz/files/file/kixojawotiketupopalozosuv.pdfIn PDF document text
    • https://wittnebel.dk/file/gifupebidofepomu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/js8ltvpdphe8hmle7sb67sebq4/24908486777.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a66f25ef3---sukinonuja.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/pogofasivokikizuj.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/60533699409.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/frdmipn4q06fang1bpe9708qi1/rigagudapuduzokiruv.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d56e0f6d---raruvebapavevureg.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764a0af3c6d---70126364280.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/60592768715.pdfIn PDF document text
    • http://hevolta.com/upload/file/wuxezinazovilowimosufe.pdfIn PDF document text
    • http://juentai.com/userfiles/files/xawowibibofibuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nursing+code+of+ethics+philippines+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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 15824 bytes
SHA-256: 25ae27704c77f8a50a8abaa79828d1052dc2477b0bb9d14e813c9f1987ef74b7
font_02_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 10816 bytes
SHA-256: d64b022d1e5f3c58df573bdb51b236f95bc5878c77de23f7ce8c501360c335c0

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