Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca7c70bd6bd9a6a…

MALICIOUS

PDF

78.3 KB Created: 2021-08-10 12:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4d10b8f06a7428369e1ecd1c4bce0ce SHA-1: e1c99ae82da5ad507f6c667b6081cdf92aa44e83 SHA-256: aca7c70bd6bd9a6a679955472afcab3740f8c718abbfed12b9d1a691f2c0517c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to redirect the user to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88c0b0351faf9fcb891c568e1b5d925b/womulutilifadafe.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54168cbd84---89848754064.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/tikomeluxulegokasa.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84cdc2ad4---27972067469.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/53d996fe746d2fb7e593796b035188a2/wovem.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/kasixetam.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c8e9c9d2089cdad125dc9ab3452c4c57/11426858549.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c46852d822---72092529479.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baf894e6bfa---wunaz.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6e0f972e2d3eaf41187d4257952838f0/4000077327.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/vavimetudusujefefor.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1cfbd9b1---64467061413.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hl5s4sd3meubn40oul9lf6ipic/90098865439.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8348958a0---17682377623.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/26453379973.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c039c35cd---89232369988.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/46bae5a83cba69562fc44c3b0d84909a/87458339912.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/v9g657n9n1uvruc06cpdd9o7oj/nedumoguvimidisejakagu.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/fivojoduvinarotilotuf.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4aav057194sghk21g2c4arm9mn/43893176094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=why+did+beowulf+fight+grendel+with+his+bare+hands+brainlyPDF 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_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 11068 bytes
SHA-256: ba2293a90dcb3dd0940e8aad6dfa105f66e3b53373c9b3f9e0776f2d84ab0866
font_01_sfnt_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 16572 bytes
SHA-256: bd6032eddec122908abc7aa9114d860fec3cbfa355d13703fb237cc34b771b33
font_02_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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