Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d3492f51b581b7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 03:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d844f265bb87e2abcb23d67fd60d5af4 SHA-1: 614da784e3c2630d6bfefbab076ce1fc975fd61f SHA-256: 21d3492f51b581b72414054923dd10882826395f2bbd04edf4717abe67d67b6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF indicate an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1b14ddbr3he41e346ov826h7hv/bifubekenetijeku.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/47385511375.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/a8d5vf2e3gsc9mvpmhk4mnff97/fililujax.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/53099153694.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/26220976612.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/zurusonet.pdfIn PDF document text
    • https://hirurgija.me//files/suxuledojulimorufafe.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8699_20210722225909.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0133e56d2a---medetipixezifepatileke.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/muxododujazogifesuja.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k1hdhn3alr6gp12t9r676vo1s6/pinanamosoxezevej.pdfIn PDF document text
    • http://nfc.soo.jp/file/86869842565.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3ed37bfe---rimepixojuzobofinotapuwib.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609779e18405f---xuwusazizemozozexanif.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/24164163549.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/kizufobudoxu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b013a963197---dolededelowujevirefen.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/89866730299.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31073200234.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jovol597sj2r7hnrh3uji8urel/sekadixetobona.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/13359223716.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/82219793328.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6c087158---jonejomop.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0a93c867c0b2a31c02e3330092beb14c/vodamolesimunakugejupawo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f409ccef1e6b839ad7230a9552b2c0f3/pusamidobijudajolukotejow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=regular+and+irregular+verbs+french+worksheetsPDF 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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 17944 bytes
SHA-256: cc3066aa9f259d9cba69adfbcd02db287b687c20a92bec91517679175834d811
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 11284 bytes
SHA-256: 598da4225a122071aa1127fe65526f016e8741ce033c941f0ee5e5a8ce8605da

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