Malicious PDF — malware analysis report

Static analysis result for SHA-256 1340b170d4f60617…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 14:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c395a8ec0a3205e793f766e14a688c5a SHA-1: 01370fdac546adf2145f7bf2b930de27afc6f421 SHA-256: 1340b170d4f606175e4deea978ea61201dbb874af4c6a39251104fb7b98a0992
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm and a payment redirection lure. The embedded URLs and the nature of the heuristics strongly suggest a phishing attempt designed to trick users into visiting compromised websites, likely to steal credentials or financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=how+do+you+use+zwift+on+apple+tv PDF link annotation
    • https://tideandtigers.com/ckfinder/userfiles/files/tuxafolilubo.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/kozonenaninoxuzobukeru.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/bazunitabuje.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/92048965397.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/16e28863ea475dd8f12e4290a836eff8/pexinapasipedoronijasigu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608363b146a2c---tomuta.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/5643831187.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/gizakomufodiwevexaralo.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/9628124036.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/85542954323.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7f69469bcb57f03ccd97ac3e1e03f010/wivazunowugakakaku.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/563a3ee5295cc33a2e9557a93d10266c/damizanologigumufo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/51842788417.pdfIn PDF document text
    • https://htchninc.com/d/files/65387463904.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/saxawazuxo.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/kazijumizi.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/74137812745.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/jakivabozubinowulutazepa.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/31e04ed83192bbb1de508cc016cef5d2/tenokikezimofipubatenopib.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94f3e5bba---76098204180.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/28207720902.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h2m15g7e88hjq0c7tj5h7db7g6/nanesufatuzevu.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/gojuwotuv.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/9637609622.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/jomelagoraja.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/36928873192.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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 10808 bytes
SHA-256: 784eee410abd5f75b14249786d32df9543a86be39031ee8a40a856274008b962
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 16940 bytes
SHA-256: 877c880846921edd4985e155f19cd011d1d7986362b1197267aa9a5d209b4660