Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5342dc0e3366b81…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 09:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb72ab8c46c11d6c2389aa49b8bd0935 SHA-1: 5fa835b33f9f9d4f66acff2596cfdafcfb89d616 SHA-256: d5342dc0e3366b818f9ccff36d3cca1d42d29c30315800bebe7962efe4c481f7
176 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised CMS uploads and disposable hosting. The heuristic 'SE_QR_LURE' suggests the document may instruct users to scan a QR code, a common tactic in phishing campaigns. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=how+to+connect+my+phone+screen+to+pc PDF link annotation
    • https://kanalprofi.at/UserFiles/file/jidinuzufepezuguxazazemes.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/soligowowejonutobo.pdfIn PDF document text
    • http://synphabase.ch/upload/file/vasubonejogif.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0bf311642343319dc84daa0482ed0e6b/gabarejaxisiwelibepusogu.pdfIn PDF document text
    • http://wmsone.com/eimages/file/lexazamuwo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/dijetavid.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/30136251609.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed69457407---34803392985.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/tudemamezozedugatugo.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wamubizofexemugavef.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/sonusanikalisiparidem.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/51081485799.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/bibemek.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/mukimevexivagudeviwinuf.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/lenakiwukalatifipikoker.pdfIn PDF document text
    • http://esejsc.com/upload/files/loxiw.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/19945691814.pdfIn PDF document text
    • http://balalajka.nu/media/70296040540.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/13371207752.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/rafixojexesotideki.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/99126031145.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/2182919363.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///12436862011.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c4f77cdd0600d719c4a28fca2a1f9820/fogob.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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 17628 bytes
SHA-256: 08d5b3c04c87e433614ad7040761df448122a9beb1b969af2b0cd0126053652e
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 10528 bytes
SHA-256: 48d1745862a969737372edf44ebf7a36fc50a26333bcb63823406de5dc2262f4

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