Malicious PDF — malware analysis report

Static analysis result for SHA-256 f638e61e9a5da0fe…

MALICIOUS

PDF

69.0 KB Created: 2021-09-12 06:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37c7e6ab33091601e37a63d25ce202e2 SHA-1: e8186bbaefc13aa0391b81b5c453e88c81dc5539 SHA-256: f638e61e9a5da0fea74b5b1dbea5b5feec6807f5384dba3f7e85c6e670d8e90c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's a link farm hosted on potentially disposable domains, aiming to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to lead the user to a compromised site or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://lahma.pl/_u/userfiles/file/topoxokagixajumul.pdf In PDF document text
    • http://americandeliorder.com/uploads/files/paredisakamumisavamarex.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/juriki.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/22393009371.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381858f4e6---14637985091.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/kudizovajaxiturar.pdfIn PDF document text
    • http://otczenacts.com/media/files/dirazububejidesujofinone.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/fujoxevo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912845472441.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b709a61db1---sezolufuf.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/fodokexonisofesebi.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/zenusotob.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/dovot.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/88266654221.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/tupawowekubonexivo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/02c6d9b89ea115f7eeb5747d3361918d/55786228951.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/96580918552.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/20639425208.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/93851729314.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e43c1a003---4050982571.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ff7cc9fa49a610a2d850688fa5eb0086/kunuwugon.pdfIn PDF document text
    • http://crm333.com/documentos/file/18233561792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=clash+of+clans+gem+generatorPDF 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 10724 bytes
SHA-256: e3d290189c00d0403ff83d0f597449d4547d846f30090c476d961170645380dd
font_01_sfnt_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 14228 bytes
SHA-256: f57e7b9a7cf68e484c5fdccd9c7557c5ff740600693bfe14df84f5882e46fb48
font_02_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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