Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c318ea3741ab9e…

MALICIOUS

PDF

250.4 KB Created: 2021-07-01 15:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 621fa9ead2ecb69d91c3706cfed4c42f SHA-1: 2b8cc127836712268cbf76566bbc823809678cae SHA-256: d8c318ea3741ab9e2084ce36b00eadc2155518ac737ba163a1d6e804a62494fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristic firings point towards the file acting as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=the+dissociation+constant+for+acetic+acid+and+hcn+at+25+degree+celsius
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8428f24b23fa659b6cdfaef6815a4043/96952986694.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842a01effed---gojemasijopiposo.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a6a32de629eaa24eed5b66256b9268dd/39613322723.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855c3f78fe0---39415197135.pdf
    • https://bmat.mn/uploads/ckfinder/files/pewaxorerigeketenuga.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e6a501d080674d4c4f73b767b04d8fea/posulututitamujejatigesip.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a07d5703dc0---86789785506.pdf
    • https://deniz-sogutma.org/img/userfiles/file/50280732166.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02eb353cd4---41695509632.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607182ad706a1---16149504165.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/106636f9c9c8680090277bdaabc3eae6/21277031190.pdf
    • http://mindentudor.hu/userfiles/file/57486484764.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075086ca089d---tiwusotopu.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/af6d341a5c830f3420a2c98c3ebd7bc6/nodumanuwigi.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094098614e68---74161612927.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sepawomisinaginujibumax.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e58f290d---mijodubetaviladu.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/siguwakuzilidakinugoli.pdf
    • http://asijskepotraviny.cz/files/file/39206387425.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/164e4cf925ed1b7dc80297b5e385afbd/86767530136.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7lcpk7h16gv2i055kea13l98uk/4486726852.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5517c2127---wirepumizejaz.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/25b376ada7da8aa135180822aa4e39c7/bojelenelufuxexixiworuk.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00037509.bin
7f56ec63d04ab7221ff5b98b9f6908c98647a9eacf3ad75948dff7e320d58acf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37509 29392 bytes
font_00_sfnt_off00034351.bin
def4fd54eb427ae2927da9ce3ff490da32680d0f9b7f80db85d55f0f7a50f930
pdf-font-stream PDF embedded font (sfnt) at offset 0x34351 11072 bytes
font_01_sfnt_off00035cf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x35CF7 16792 bytes
font_03_sfnt_off0003c482.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
pdf-font-stream PDF embedded font (sfnt) at offset 0x3C482 16244 bytes