Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36e46e792d57b5d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 15:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e36a67482f39dac156f0966ac7aa38d SHA-1: 5364d4d21fafd1b12dfd2d1101f61827da8e233e SHA-256: e36e46e792d57b5d3605b8b82adae9d5bdd57e396c51765e59a7955135d620d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing. It contains numerous embedded URLs that point to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The presence of a URL with 'utm_term=halifax+online+banking+app+for+android' suggests a phishing attempt targeting banking credentials.

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 https://synerhu.ru/uplcv?utm_term=halifax+online+banking+app+for+android PDF link annotation
    • https://fnb-concepts.com/images/uploads/files/95954406738.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/bagotufipenigu.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/1779389394.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/defisopebevopegipipixixe.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/20156852231.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/gileribisujiposeseme.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/78302014968.pdfIn PDF document text
    • http://precisao.org/files/files/wekef.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a654336522c90824b7221c60741e795f/kefuwulojivosagewiwuv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a2cad04f617f2f72abc78b2491721aec/wavaw.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/15287243806.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/13149527826.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/77010678191.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210901064159.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/fafolo.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/fenutujudumegawufovuxuka.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/93195578758.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/177663535561394ca24513a.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2b3b5f9abca9ae706b77d3c7961e81bb/mokadu.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/91601605770.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613336a82e74a---68280143385.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/mikanatonof.pdfIn PDF document text
    • http://trubaopt.ru/content/file/95490631348.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/61976707466.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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 17448 bytes
SHA-256: 194729f4f7ffce7a49ac6e3496d85ca2480ba019d960b1307ee8147141dc0127
font_02_sfnt_off00013000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 10732 bytes
SHA-256: faa9893802324a885c21d6e55c2710f802e5ba6815314fdbd9eca22283504846

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