Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22a00edea2fad05…

MALICIOUS

PDF

85.3 KB Created: 2021-08-05 03:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4bce9ccc24ebcb4d6684cc8b30b97de SHA-1: 2c6af533bb916bd7c64747320e0dc11e7ee2162b SHA-256: f22a00edea2fad0528472025639551ddb807e7400b0cf1815731f0a067c51986
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. These links are likely intended to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cjandjunemillerfarm.com/clients/75830/File/79525942295.pdf In PDF document text
    • http://kxnjl.com/userfiles/files/70623889860.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/72969736298.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/karifexipebodovizid.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/18529221631.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/nifalikamufo.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/37083714087.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/68257945027.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0p5j9i46iadld8ddqgtv193094/93432166294.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c442cd7e32e---pinaxutikexamezuraju.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/darafogiza.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/64c06f6dc2988bc8cbc094f30ed0589b/nugoxazolovilelijejeturem.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/mabanudekelepovumupuwev.pdfIn PDF document text
    • https://loctra.net/userfiles/file/20288193567.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wosug.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107200112098862.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/46290933461.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/fibemunivufimofi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2739c5c090180647050a7d0ad97fef2c/vovil.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9161bc8d---wugusavegavijakarax.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/614e2b899f9e09936e5bf079afd2447e/ratofozobodivexiwasupeb.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210614194642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+1.11.2+apkPDF 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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 16756 bytes
SHA-256: 28470d2a897e3a4cbc9315f719bfabcc351bfead9e7ee5fbbe75b25dad3edee3
font_01_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10464 bytes
SHA-256: 2a00836cf7c848e34206b93c7f08644092b22804fd0f177d2a1aea3cfd409ba6
font_02_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1