Malicious PDF — malware analysis report

Static analysis result for SHA-256 643d4580301494cb…

MALICIOUS

PDF

78.8 KB Created: 2021-07-07 05:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c8116ec123d7169c6cb75097b86d4cda SHA-1: 2fccf54b4c5cf73667c6be282124e41fceaed2f1 SHA-256: 643d4580301494cbe7ba6c89d1eff34ff9e311adb8ac4645c4aac526dd7def28
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farm patterns indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608974f9ced67---50204955341.pdf In PDF document text
    • http://septumdent.com/img/userfiles/files/31354517411.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/u0ev7ekremdkg53ov3rmpoorii/77482155964.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/2816356002.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/dasalakukomuvazusewup.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231b9b9f8c---58569412378.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/lixefamasudeb.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a76adb3b7e5---76244485347.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076adecaf467---3253263447.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/guzubogulekejemuk.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b563a40a2cd---jedudemaporelegewup.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/82877967225.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f97982242c9decc595650e30f2344f9a/kasezizujedomijovevaw.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a7d5b13f9c97893dbbeb1986887fd4be/tadelamezirobe.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ff4244a---75976748102.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/70038741570.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/julerajipuzetof.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87ff19ba2---sosaxakow.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609625044d9a5---90694019249.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/reruzew.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/44454489609.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/55226834190.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/03523f079c1327dfe9b4a18586b297be/dazikukezanigenisirowaf.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/55337314246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=find+the+inverse+of+the+relationPDF link annotation
    • 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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 10496 bytes
SHA-256: c37d465f56f6d7c877ea33d016733a148534e7104eefef89185928bd3e6c73e1
font_01_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 16720 bytes
SHA-256: e879d0be488a072bb3106f04098523782c7bd4c0b5f4cc39e09aa202d2253488
font_02_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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