Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7c5ab97ca4f0d8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 05:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c312d55122062c62abf3f981e6277244 SHA-1: a5740ede35f29e60996071f9b7c16165ed961e59 SHA-256: 3d7c5ab97ca4f0d8159763076fd9abd505c7014e12e33a09238d75641069dbc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites and disposable hosting, indicative of a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=another+name+for+indus+valley+civilization PDF link annotation
    • https://aprenda-atdi.com/uploads/files/mamoviso.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/51903480722.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/60937411381.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/kuwoxubeponusafiz.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/78978697732.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/22295926558.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f94a2233c6e949de6408784fd54dec23/10690769284.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8849443bd80da81df546f206f0e0262a/segoguzetaluzosupemego.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/wamimeboda.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/47ck4sui5krfgc083a1r1qddn1/75482721476.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tepemefuguka.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/robexefez.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/jobabok.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/97694451592.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609556b2a1273---56454304150.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6127cc203---lobixofejiwunutegofixiju.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9255a33e64467b1c82373c7c3454a54/zimusasiposo.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/lugim.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13f35623b---sikupupoduxij.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9bce7db---vazuvi.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/86733503680.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/xifogobola.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5300c0887---samevegufazupufoverarojab.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_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 15748 bytes
SHA-256: e932e2f3575af4fd584b745e9bf46057841768cc8f8b7a3d75c115bf157b5ab7
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 11060 bytes
SHA-256: 1efb7e746dae5aab055a95532c0b5f4ddfc228b47b2dac4720b0dffc402463c2
font_02_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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