Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeeb4b577e10db3…

MALICIOUS

PDF

113.4 KB Created: 2021-09-05 19:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24676afcd15c38fcf8d973593d13b060 SHA-1: 6938a0dd35a8c193c81ed79ee33579612d42c901 SHA-256: 3aeeb4b577e10db38cf2bb0d8cb552bc54f073b99ab6cb6d1298065dc110080c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e407cc4d---lopuzuzafimogojilalorefud.pdf In PDF document text
    • https://eqonetech.com/upload/userfiles/files/keneguvomedapowirivaf.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/58477802997.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b378c250---10981674664.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102be36ca782---xavabe.pdfIn PDF document text
    • http://cecev.com/stockages/files/40716890093.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/blvi8dsgnlf9o828rq4uq5r0c7/95394412529.pdfIn PDF document text
    • http://msiutilities.biz/documents/sonajijixiwobusakuto.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/zijuwerezuwuzexivuxagoj.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/talarevaga.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/96439275978.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3a02bfa915d10328143cc885efba38ad/28288037854.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/94855619049.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fopudizesil.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/90d4ceec88b098a92a6b60082ce702c5/duwasoweratodedoxupeloso.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/27478876661.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b15ed18d---75580585463.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160f16ef47bf31---89830541830.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/23788689792.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/dukutunewu.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/tonudukiwojewisiweto.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/7922202261.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/79602312981.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3bddcfa7a2b8718cae4adfd8673bd057/bubomejetikonoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=que+es+una+manual+transmissionPDF 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_off00015563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15563 19636 bytes
SHA-256: eedae1543129e1fd29be5b1eb2efbe52fd38854cc65f8ce748b59ba08e36c924
font_01_sfnt_off0001878c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1878C 10428 bytes
SHA-256: 3cf87f3dcdbf2eea723d490a91986a6f34136da862b5674fbeafc333ffc7abb5
font_02_sfnt_off00019f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1