Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80bfa4f73c0281d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 16:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7d82387b388a50329f942397a1a5432 SHA-1: 779f915f01d80d459c4cdb43bd9bd623614c6f29 SHA-256: b80bfa4f73c0281d0103201c821433442774e63bdbe4143aed2a068ef0a37837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware-hosting pages, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://safarang.com/basefile/files/duperosefotup.pdf In PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sikefenu.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/kojuti.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/pogobinutusazozopid.pdfIn PDF document text
    • https://masihpt1.com/contents//files/18455926963.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098da312a4f8---lepazuneba.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/25411121312.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/26588048733.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/80693120429.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/11159878339.pdfIn PDF document text
    • http://ledson.ru/upload_picture/gudarukopuf.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/g9u90qpa0i74a2vuqd8ug1fmau/42276462382.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/nisixogako.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fuvenoli.pdfIn PDF document text
    • http://maytinhgth.com/userfiles/file/62933709899.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/12241058465.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be49f108ce---zikasebij.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/4083225587.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/440d5c0a11281618f5ca4f9e0855a85c/27073321979.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/68582993187.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/09a04344878e00a458aa47703efc174f/xelefufesupaxurofewase.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/48002782393.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/vixirotitigixukufifefo.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/8151542261.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/maruzevomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=understanding+catholic+christianity+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_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 17552 bytes
SHA-256: eadd0ba4ff6e50ef03f6ad9313dd3eb419a4d33c227721eeaa2d7f265fdc81f9
font_01_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 11020 bytes
SHA-256: 3e40a6e0b6dafbe64afaacb41681ceec755f60f7ab9b3a4784b172d2d14fa567
font_02_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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