Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a26a535637c489…

MALICIOUS

PDF

93.0 KB Created: 2021-07-21 03:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b78b8ca3ce740d8d25fc9cda7475dfd SHA-1: ce9c0619668c71236c9c7f91fe17a8ecd7ec8a9b SHA-256: 30a26a535637c489bbe5435787421e73f7536fbaf16d29485333a0719851c0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute or phish. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites, often initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f75131831a0---3558693936.pdf
    • http://antifftech.com/uploadfile/file///2021050702091142.pdf
    • http://cloverpark1959.com/clients/51168/File/4750322472.pdf
    • http://lmyc.net/clients/875386/File/kapejijijop.pdf
    • http://jinistudy.com/_UploadFile/Images/file/nejizopevetefevivufex.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/winisavuj.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/walok.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b9b8128a1---bopeselodobebijese.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/21288526246.pdf
    • https://luminex.pl/upload/file/noponibewep.pdf
    • http://szentimresiklos.hu/upload/file/70636861795.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/k5fn8mhpcand9dd6a8fg9mnnd4/67461655835.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6affb855d2---kuriwoxupomisum.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e5314554c---raledajofados.pdf
    • https://coebmsf.com/userfiles/file/13364767585.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b3d71f59ad3e7658353608e104bac70e/tupetutewukajosot.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v7ta1g9o1meek32ll33rdi163r/dijeneraw.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/56bdcvoe0bsco8pqskpha55uq0/sofota.pdf
    • https://flyingfish-stay.com/userfiles/file/52455765037.pdf
    • http://islandpointfl.com/userimages/golefujunofitawapamariteb.pdf
    • http://aqbnb.com/uploadfile/file/panuno.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82595638279.pdf
    • https://chezgregoire.fr/userfiles/totaniwasebiragemomabenem.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3ufnf1t95nofvumtrhv2g57k7/9246524899.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b669a22adfb---59445648868.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=guided+meditation+anxiety
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010954.bin
7ad6cd7f2fb585433f5ab2eb4e002ce5b155e5ca738444e782dc78c816160c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 17436 bytes
font_01_sfnt_off00013702.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 16792 bytes
font_02_sfnt_off00014f19.bin
567b0391708b39531cbd428c313ec7cd3e069368ad988245e240848d882a9b9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F19 10452 bytes