Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c3452b28859b45…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 16:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e92c69acde70f0a062eb05669b541ab SHA-1: a3e7ca09dfe07bae4e385d22146b0bed7327e55f SHA-256: a3c3452b28859b45f262ce7460f8f0a321286188822ba6889659fdbca3c431bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The embedded URLs suggest an attempt to redirect users to 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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252887cdf---munixezex.pdf In PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/gonaxim.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/18192930182.pdfIn PDF document text
    • http://ty-int.com/files/files/55772282219.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/22759745257.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3ki9v45n20ngjkac4qfdcshv84/76794574984.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/159268466760c8ea15e9e4d.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210718063302173.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/28792473176.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ffb886615---zojiwogasigigig.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/jetevajutar.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a2e6e8eb---95757981313.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/66741543991.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ba3b0a06---5312685350.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/84424557794.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/suwopobib.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa0fd4ea2---gisemozuneginu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160752336de1c5---jalizuwebogavagelegatem.pdfIn PDF document text
    • http://sakra.sk/storage/file/65706062443.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/zizabilotivuw.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/80rii2t65sj6c26lja98l29ggg/7956427411.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad64b19ded---sosamexibobagakenutitixo.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/7603296637.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gudulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+nri+accountPDF 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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 10604 bytes
SHA-256: 4cfa62ac222036b79b52ea7b78d73facbfe09a6d2d5e13faceecc8375bfbea54
font_02_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 16740 bytes
SHA-256: 18af9a89385e4da8ab6df268f3355a4803060c9e0a5a93218179a172973e741f

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