Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e4a92a9869d47c…

MALICIOUS

PDF

89.7 KB Created: 2021-08-25 06:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1237814b124019d17aea07345ddfb765 SHA-1: c068768096b49666e000a9ecb5ee4d551dee1c61 SHA-256: c5e4a92a9869d47cd5ddcf0906692670174608f526959db4213ed484e212737f
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 ClamAV as malicious, specifically indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which host further PDF files. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa477f2e1e---48154947610.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/550efe0b71564563c99f411f8ff27ac3/3844426101.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/55663879287.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73c1c2017---febesuwixi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/95719169501.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b27edf61---35557153283.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/fenujigivoxunor.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/letowezefugogisekupaz.pdfIn PDF document text
    • http://3q1p.com/upload/file/210623201702361376igvc437zseyj.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/80879556840.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/votazevebadomumizorufami.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/80406789088.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/nazumaremibugotakos.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160835e6c57fa5---puzurakusolubivofu.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/kufuzewomesogufejusi.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/janakunuku.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911de5a890a---71297832688.pdfIn PDF document text
    • https://hse.tw/upload/file/wojilugelosa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/32ddeaa6071c4bf7f089b5be3f343b9a/22728567724.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/zosifamitomenabuse.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/d3419drt4adc5akjmpdun5jm7f/87607515421.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ftbrpkcak1js8hs7dfq6ku60qu/nitujozuvogegore.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608653cf3ef15---lejasuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=meaning+of+observablePDF 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_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10488 bytes
SHA-256: 3b3b68882ee5d6f56ce203acb7968804778cb30f662a23be0815866fa289a58e
font_02_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 17620 bytes
SHA-256: 3e760d1f156027cb62e9d3002b4f3723ca42d3cd0c87ec6c17a2d4cc5100b709

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