Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8f7b734d5911d2…

MALICIOUS

PDF

82.7 KB Created: 2021-08-07 07:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9cf3e59e45d8f11f36c379a6e7cd3e8b SHA-1: be7a839da7dadbdec23ed1cc3b9b6ee7a8fa8991 SHA-256: 7b8f7b734d5911d2823437243709109c0f03b30b3e0b6be407ee864c0c398e8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1efaa1653---40792952270.pdf In PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/13282022758.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d1c7b43284df34c6d3107b97b31ec541/kenadadime.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/58066741574.pdfIn PDF document text
    • http://dso-fuzine.si/docs/61865790683.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///90496189001.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2d3c0b77a---giledatoveres.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/18095088831.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/8272809235.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/34122644071.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160769d4368f30---51729327982.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/58429510947.pdfIn PDF document text
    • http://pk.mo/userfiles/file/44873979200.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51b5dc3aa---93542398436.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607154d020d1e---mujajevepo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5b09eba1a51573d5fb011331c7a8a640/92821908392.pdfIn PDF document text
    • http://ecole.ru/text/images/file/lisemenerivaxezade.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/73411254289.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vatividupuveg.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/c3c865f90b45d21c7d3b4c3dfdcdafb4/fufarikuzovubijigutikiw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c461cfec773---72628621320.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/lokagivibagutemir.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/4g42sv38ief431r3lgqop32835/gutedojuvijow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=advanced+total+knee+replacement+exercises+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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 15824 bytes
SHA-256: 3f1197851a6fc40bdcb44affb8afdf55bca870f295e9ebc0f852029acdf91777
font_01_sfnt_off00010ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 11024 bytes
SHA-256: 84d9fd22f63a474e521268d84941e6158b3567962da7b3140e082f69db57ac86
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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