Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64d004c3c5342f0…

MALICIOUS

PDF

94.2 KB Created: 2021-07-07 10:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 027e0e2ea5d1a07ce9071e0afa77d3d4 SHA-1: 00835c628517c91204d164c590454e92dae06418 SHA-256: a64d004c3c5342f09bb4ec5b63c6b6897b60fd36c81ce4fd8381a9e73267aec0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to WordPress upload directories, further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://boilerservis.ru/uploads/files/setawotulaxemonorel.pdf In PDF document text
    • https://cordovajewelry.com/images/file/25363345618.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3d68454eab71b5d1453e312ccd49fbec/17227175959.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072bad9b91eb---56910544377.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb716dd3127---69639780621.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/xowivipebanilime.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7996bfe758feef3b3823900e7a5bc9ae/90570048570.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/em2tbttkkfvr70uut44argk3fg/6250170531.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abab26dcfdd---16976843803.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085c16b65b9a---pebisilaworofatozesekozi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jshqjuk2p9le2kbfclco6rflp5/kifovutedubipitaf.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607da658e7d7b---90578283097.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/daliw.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160718c7b047be---96892213707.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/turivodozububuzuke.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6526f5d3983855cef8a037bce969d3a0/gexeliwujuwubogin.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/5241795469.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/kuzumuwimupinupi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757b4781e66---37289990133.pdfIn PDF document text
    • https://emmaushuis.org/pages/57662410515.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b176da9d133---40473836088.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5da9695005df239ef4739f3369fee59b/wikop.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/banajividajubi.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/kenebusafere.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/26ajhi4t994eeha2l3sbd8q1c6/67404237831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=113+6+lbs+in+kgPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 17624 bytes
SHA-256: 2dc183029015760d0289195e364389d10f801b3478ef2f16e996b5acfe6903d4
font_01_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 10200 bytes
SHA-256: 8b5fa508338126b7a9d479729a3afda74f488616ca4362f774c4f25b4ef1a788
font_02_sfnt_off00013e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15688 16192 bytes
SHA-256: f7b9253987216832ec511a3c7ffdd777d8ae21bfd21e5a9c2e014f7e310ea55e

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