Malicious PDF — malware analysis report

Static analysis result for SHA-256 512c8486c0620720…

MALICIOUS

PDF

76.1 KB Created: 2021-09-26 10:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 260da26fbcd61a79a82ee2cbd6a10400 SHA-1: 0deaf0e14c80c75ba0032814a0d553fe8e4d7de2 SHA-256: 512c8486c0620720f0b710d0eef0f643f295754ec41b5a9ede06d3c5a52afa35
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, suggesting an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://smidgel.ru/uplcv?utm_term=emulador+de+wii+para+android+apk PDF link annotation
    • http://ovstav.cz/app/webroot/files/files/gisafigogureraganega.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/13388763218.pdfIn PDF document text
    • http://www.bash.cl/media/file/zadanevanuzavujabug.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090523001660.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee097b19cd---98514626246.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/lanibuxibimibopu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wabulezalinuka.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/tolalirepajenaga.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/mukimevexivagudeviwinuf.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/343095360.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/64712429787.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/20/55171993382.pdfIn PDF document text
    • https://chilepools.com/contents/files/makujagomav.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/nekalabaxorotavovivepexal.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/dukumanofakizov.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee31a1127---53700610340.pdfIn PDF document text
    • http://hla.vn/upload/files/tuvek.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/gufopiwobebamejexilaz.pdfIn PDF document text
    • http://elitacasa.it/images/file/95585092137.pdfIn PDF document text
    • https://promise-land.com/upload/file/gatuxugek.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/31412309155.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147435fd6cf5---25168943001.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133320f41dcb---95807862452.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_off0000bf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5C 19768 bytes
SHA-256: f0f221e64ac5003ad6fb755f3f5556b9fa42b04eddcb54c86920463501dc91c4
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 10548 bytes
SHA-256: f89fbfc12a1fe3c5382c6e0dd7b63f687e158b334032df35d2f71b15b636d769

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