Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66be6208f5a0aca…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 19:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8999c4283ffb7e2a9d8ca5f99bd160e8 SHA-1: 36110ebe2a757c5d51f70e81bc13e09361bab6f4 SHA-256: a66be6208f5a0aca9c1cefe229c8b8f12e6d2df88bf47e0ab9ff52827ae4eb96
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically points to links hosted on compromised WordPress upload storage, suggesting a tactic to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tomgiongvip.com/uploads/files/file/62720697857.pdf In PDF document text
    • https://ebooksweb.net/files/file/bumafawamosawifeji.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/87927264925.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/94118267759.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/483db21de9cf04e89388e9ada278b188/widimix.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83667906202.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6c26bbcaf6a32153b0ee4475f82222d4/57670141492.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/66526871590.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109040323201772.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d821d6a9c0---zudobefixosederavelefesiz.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/42739123355.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/70857377770.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa9a71b334---38638170889.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/wedugopafewezuxapo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/54827683942.pdfIn PDF document text
    • https://brs.jo/userfiles/files/14479285451.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mipanuza.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/zurugepijurekuxeg.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/salomufo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lozumewolilomelubuk.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/28275812457.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7a309f8e353ec56b8d172a8d360de4a7/57286747605.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/82412763122.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/roturorujopoxasabifovebox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=material+button+android+githubPDF 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_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 16692 bytes
SHA-256: a67a219fd30eced631acf176db9f1611e6fd0558f2f65a9e120eecb3843e7320
font_02_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 10592 bytes
SHA-256: ca83e45fb5cdad0ed423bc5a08aab81c2ec2f92eb6c8d32299a2c73274caa81d

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