Malicious PDF — malware analysis report

Static analysis result for SHA-256 b244b049d13caa45…

MALICIOUS

PDF

88.2 KB Created: 2021-08-03 15:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f3c5cebc37173cc774aab0e5ffe95557 SHA-1: 2eda8db547fce6aac871dadc67ab331df34e01c8 SHA-256: b244b049d13caa456cb0d41067bef7b6b2f4932a7586cab0a25044485a34db4d
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content or phish users. The presence of multiple unknown URLs further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082353c2b489---tewolenirisejimotofu.pdf In PDF document text
    • https://agentcctv.com/userfiles/file/vamisijokenewedefatowum.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6a04b5bc---89360705751.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/bawimemelalifulilokew.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/defuxuxuxepifitaza.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/be6822b23183c7d6006e5fd63841f5d8/15603339767.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086537325c94---vizawugizurudupodujo.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/pomedujupetesokinixe.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-12/20210512181846792364.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c3effc3298a7ee052f3d701e8bc7cb0c/vejetoravojutafugivesi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ulhrobft07h0s4v9eq18fe7q6/71579458820.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/99611229313.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/narajuxetemuzipovadoju.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee688d74cfc---96857368894.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/8209709917.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/6049214136.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/zibajixewiza.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/117ce4e3f6a4f88a38c39c687c9e181a/72246824220.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/42244354665.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/44599364317.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/be220f7f341fcacd0fdeafda608e7a9f/dipajijafesa.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/fenamejujafelegen.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a7049e8c6d6---teruvomakozajikupomu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15cba2fb9---kexizitorolap.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/gefowiromafutugugudozaj.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e9005ac65---49056085054.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/74230888902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=holy+rosary+guide+tagalog+pdfPDF 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_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 10772 bytes
SHA-256: 0ef3a76f24de97187daefb190a3f9132acfe469715e5224b2cd271941b7ef226
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16880 bytes
SHA-256: 14db01cc50ff6604a6191c696bdb40d2b42f9d5acfb58a3e591820cff3470aed