Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba852f04a9c55b2…

MALICIOUS

PDF

89.4 KB Created: 2021-08-05 12:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ddb97275929e630371f6e4ab4e0e60e6 SHA-1: 9abfa21e920615273b8cd934350f73e1c61c0f4e SHA-256: dba852f04a9c55b28751396f9cfe544b691b6143b0e44c8d56a1f5faa87828c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=jak+daxter+power+cell+guide PDF link annotation
    • http://asustainable.com/global/file/11738101545.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/12010368113.pdfIn PDF document text
    • https://ancoraeducacion.com/images/35962382148.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/vuvasovetujaki.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/11050968561.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6c9f61026e912f9dadb730e509b0554a/mafuwe.pdfIn PDF document text
    • http://asvpp.fr/pdf/nomufozisi.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/nipunu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/98560584846.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/df7bce79e4f1324a864ccac4ec8ff27c/bakutosekodikotifokawiruf.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/268htt3vj69blpvsll025a0mi3/vimebef.pdfIn PDF document text
    • https://goldenapp.net/file/dotaki.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/32499573495.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1608755c---24154228071.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/moduwilepane.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210707_354BAFEF1E78FF26.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7ac2f359---zirexisetatiludud.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5ea9351afb195bfce9e3a6d8c4c784f2/11999085493.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/xedalixula.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/14624835863.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/remoxaxawa.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/nulala.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/napadi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2ajknp744hpfgccjvphdsghpte/15994609417.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f42e97b0---41483793697.pdfIn PDF document text
    • 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_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 10788 bytes
SHA-256: a3a0bb52d871ed56b8cf531c20d16f0859c2b35a04350698ad7e3cf19ff3062d
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16852 bytes
SHA-256: 76ebdc78a8889094224fb30d12d4b2c703d6c16c56f305faa090fe7f2262c38b

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