Malicious PDF — malware analysis report

Static analysis result for SHA-256 d448879f2722dcf0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 01:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b0bedb8032211a08453032ee6fd5bb4 SHA-1: 57666b9d85c2746fb6a13ac74a83432b07751c83 SHA-256: d448879f2722dcf023768fe5baf44f049ae90b534cbecf4f60511edb4e62b784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the presence of many external URIs strongly indicates an attempt to lead the user to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2186df1a595705e078508f9c06abc52f/2480368528.pdf In PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/47098997273.pdfIn PDF document text
    • http://feg.vn/uploads/files/29950619428.pdfIn PDF document text
    • https://parfumzone.ro/files/file/80879907307.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4b30c28518955c969cb673ac204e50ef/22054091571.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/fefago.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bhh2nu6k2snt3o2p5dut1v5l94/nevopuj.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddf74e19ee---14084038819.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/femoratunat.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0t96qrqc0qj24qktdoq7h5nk58/lowifozozevikumosefox.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/gajawamabiworejidipububig.pdfIn PDF document text
    • https://kuepancong.com/contents/files/61079325563.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7417b9022---vigolowijenuwodagatalaxif.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/25219113174.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d27e8361bff16fcd9a28ec11bcada901/29572251717.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/zokajadevosavejuwaka.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160704283ed1f9---55519466578.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f0d8e81cc---doborazonuzawonavumulot.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/sonuzozupexotos.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/loxadu.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/62328358945.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kimig.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/78262992758.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/vapafemelam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=peanuts+not+good+for+youPDF 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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 17564 bytes
SHA-256: b2ac8b6d21641878c8220c1a2c492e68a0dda683b37080d6e7fb16c7e1562e1f
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10604 bytes
SHA-256: cd01d66a1a6f9f32db51b21cd93e93d2596a4135504a63e330b8cb2b23f201ee

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