Malicious PDF — malware analysis report

Static analysis result for SHA-256 621fa1abed3577c3…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 20:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56a3d3ed08262be08825bf04ff3f6f0e SHA-1: 2899765ecd764b03e38a2a7db4aea32228e9a032 SHA-256: 621fa1abed3577c31c54dffbc071afa1e44baa60c80d541995539594055f2c4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://opakowania-loga.pl/zdjecia/fotki/file/zakejapumonowufujak.pdf In PDF document text
    • https://ccskin.com/geektic/files/fazezakikugaseromawu.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/1126742865.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609145350f3f1---78503583632.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3049de5cb7---vurotupuwazidiguv.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/pebax.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/tigunop.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061315473694.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd86ac8d15---wenozom.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/63232201602.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/441efb577328d97a019b3f38e89c82f3/32199093542.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e17ed0fd---23269302351.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/98973489828.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75846205ad---96589573731.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/94807461641.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/75912014442.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zilojewopusemiwofegejus.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/kinakebefitipizonaw.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081550784f44---bigumilevigidobomegube.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/ralajoguzozo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161318e94de579---levuwobululoperuguwove.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084547d595e7---46257005499.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/65000126510.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/suwoxaxilix.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/wolifebekowudaru.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/xevejex.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/tojazikikesum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vanishing+point+perspective+for+comics+pdfPDF 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_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 17836 bytes
SHA-256: 2842352c9e877792da965854eb8e08a78b79c14f54f16f83f3d00784bbb6b21b
font_01_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 11056 bytes
SHA-256: 43f21710bdf4ac8cedae5eda2ca34b98186a2b5d9cf48ccf38b5e1630432f80a
font_02_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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