Malicious PDF — malware analysis report

Static analysis result for SHA-256 3496d8fe5c629957…

MALICIOUS

PDF

86.8 KB Created: 2021-08-16 15:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 639df32be9aca64eb64fc255f20c562c SHA-1: 3f1aeeeb4be4d1aae5d9780909c11b55f037ddc7 SHA-256: 3496d8fe5c629957ccde3b6f71906240ed68be43fb89db80f7b33421dfa8c481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or domains that appear to be part of a link farm designed to redirect users. The presence of these links and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for phishing or to download further malware.

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://philabc.ru/uplcv?utm_term=2011+ford+fiesta+owners+manual+fuses PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074259a99e81---napurazozezovejotewivawin.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/77998590759.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/35377600030.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/fm4atuba6qr9grsumbtuot4150/2691982757.pdfIn PDF document text
    • http://erdbau-rauch.at/71181042155.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/limafudofexoxatatasaxumer.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gqqafuru3tnlj3jebnbnh7uqq1/togizedirapowixeret.pdfIn PDF document text
    • http://kotolantopeni.cz/file/75056134365.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d7342a15ec2dfd904cb317c06180f622/vanisaf.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/87609097530.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ed56af6115b4f5c4a86ca282acf95e1f/48413292393.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/40925625894.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/71045339542.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/27185469755.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/80061370164.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16624640ab---lapugalaru.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1kf0r7c0ihfro8kj0a0n0ohp9u/46137890602.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ff93f2e688bce7adced18ec64d8ed5f1/55456278742.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3c523a8b91252a040046695fe3e1d9bc/50765467861.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ujlaggk83smkrgrve0grb8up4/90811004732.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/79284750134.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aec2d47c8---52518037176.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/23585874936.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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 10896 bytes
SHA-256: 382184b57f6817c23e18cf4866122d5901ceeb93d1458b8b211f5377c30350e6
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16600 bytes
SHA-256: 1e8a5af1e339b7ad6f96185e5d0f37d0f6bbf104a405646b33b52f8bffe7ba5b

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