Malicious PDF — malware analysis report

Static analysis result for SHA-256 666d569f533f3e17…

MALICIOUS

PDF

123.5 KB Created: 2021-07-27 19:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64cd6a06d221196026b3a6ec369b0adc SHA-1: 19e017e00f1e83eea1327a0fff869f45dc4c57c9 SHA-256: 666d569f533f3e1739765f6c6131c4d304183218adb54ef6f85799b62c19a992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites hosting similar PDF files. These PDFs likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8484085b1f91050dda8f6adc5d0d0a8a/niruz.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l0vb0n8av5mhr698g1o29pgblk/17485787475.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d667db821be7a5349b5186b4b00cff85/nawapuxetub.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f82bea4e6992efad171fc8bab8a9a7ae/tatabawevaxulugaxapif.pdfIn PDF document text
    • https://windsbs.biz/files/file/19859760714.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b5b2f30e04b33d248dec6c7f4ae0b593/44785466077.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/patekelubowewa.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfabddeeba0---woresubogabewolakejexed.pdfIn PDF document text
    • http://kezmosas.hu/files/file/kunavidifo.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/belorup.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fad0ca9ad---21312119966.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/zonabuwagelibe.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/nokiditoxixilixe.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/aaac650cc1efd204d593a6820d2b2a5b/sexopujofili.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e3fc09c8af3a5982f3ba545c03503818/wodegefumapalelezot.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/88538866868.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/34375073784.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/goxigugunemopuxufo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/48ee7ea4324cd0a61ddd2e49b7998be4/dotufojibelike.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca1639859---77420665696.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2953539f---bogivutanumukixigamegor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+complete+a+performance+appraisal+formPDF 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_off00018234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18234 10716 bytes
SHA-256: db84e4c38a98464e340f1b98483bc8c7c803ec8bc4cd3bb77e1ff50f20674b08
font_01_sfnt_off00019ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E2 17388 bytes
SHA-256: df8f984c329b72a18310f5ff60bcb10a736f5ee36016b511012c9f50fd50bd4f

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