Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0390e4dffb9c1fb…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 22:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ca554d3c5b8c0d7c8ace3f6c0bdd8d4 SHA-1: 08dcb2c91303003cf966149df27f5ece678057db SHA-256: e0390e4dffb9c1fbb19ec9d3e64fcf84c9835ffa03150799786ead24ee726aaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=i+can+only+talk+on+speaker+with+my+android PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429ea3743a0---58426364184.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/90588099833.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/zupogameb.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/jovara.pdfIn PDF document text
    • https://nls.vn/upload/files/89024069947.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/fivadefub.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d4a315fc---fufagizixebagefuli.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8b8422f5---32730617842.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/geziritesazaduzizut.pdfIn PDF document text
    • https://network-italia.it/file/40397825008.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/28009568380.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/60207269945.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/5644975544.pdfIn PDF document text
    • http://net-work.cz/data/file/65138521468.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913233001.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/79298341732.pdfIn PDF document text
    • https://badoza.net/userfiles/file/68276613303.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/16476542709.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/bolesemidor.pdfIn PDF document text
    • https://heyratacademy.ir/file/dubipa.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sc93flitsaphfmfh886t0139di/36449567170.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4333dbb0195ad46fc9d4e47d52e4286f/venoveroludazovaxubolol.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/1683047863.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/19107759426.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/defesuvukawesegeg.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/liwinalufubegexob.pdfIn PDF document text
    • http://rs-entp.com/upload/file/rikif.pdfIn PDF document text
    • 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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 16744 bytes
SHA-256: dd3473df88a06ec81672a1bd3f8470ea6ef3b7a86a500c760c6c2390c60ff5d6
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 11024 bytes
SHA-256: 00642fcea9ec2879d10c867f89fcd6cd1ca5d9e6c7503fa2c58e62538480e786
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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