Malicious PDF — malware analysis report

Static analysis result for SHA-256 a799510e317e90e7…

MALICIOUS

PDF

81.2 KB Created: 2021-06-29 03:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e809c6b732ae151664e0b9b846623c6e SHA-1: 2d04b37a2a228784d0c335015f38237a09d3849b SHA-256: a799510e317e90e7cf24179ad32e5172117a260ab6e43fc4efb2b9616cdf334c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a phone number, a common tactic in tech support scams or callback phishing. The presence of numerous links to potentially compromised WordPress sites suggests a link farm used to host or redirect to malicious content, possibly including further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e9f01313---80884038806.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/487967cbc9e370f2f49f685ad2a6450b/jafijitixaza.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f620b70d2---61058294387.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/zatakapigotelovolaj.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d7e41a8a70cb3d220fbcf6769bf8b00d/gajubafevuxejefuxi.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/85830730048.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/soxesototo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/obt1nrd415nmp6ogs39lp8rp40/kalopifegezeju.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/9247503370.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/98339e2f019e0cf20bc50f8836871bf4/18424682906.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f870a4c414da765fbfac3bccb80d3121/fufuvilevuwitavepenexa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083550865d5f---45516322451.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/49c8bd69c540b8a48ea77e59daa8a551/toxepisidivejobufegesudi.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/83744715192.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609726f4d931d---verurezu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d71b530d---39525079708.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc91c55fc9---41623149167.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/tibivikivimupusenadeluvug.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wetibiregifa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945ac1bccd---kegopavapexowederuxeleb.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090f86928299---97064814021.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/wodofobukopazebamam.pdfIn PDF document text
    • https://777mto.org/contents//files/fajixituxigilozade.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/17262644501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vision+first+frankfort+kyPDF 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 10204 bytes
SHA-256: 83b9f75052755655f432f1a6aab1413d4b01c1907175d49e77c3b0d01255d86a
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16964 bytes
SHA-256: 17f06c9f9929709de7b49d5ec634f1e601bcbad46472a5377e0750749af9c084

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