Malicious PDF — malware analysis report

Static analysis result for SHA-256 542b7d709df25efb…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 19:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c861e93ac887e9337b95cc39291b411f SHA-1: f065f8fc049fceded5e65253e2e65e1b48c0ddee SHA-256: 542b7d709df25efbef466ca7a92a099ff6d0e5960a57b403f23998ebdf9824a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af846b6794---gewixedinaval.pdf
    • https://bitree.com/ckfinder/userfiles/files/gajilovadokonilifomobig.pdf
    • http://coumert.com/images/file/28107505744.pdf
    • http://vuatoyen.com/uploads/userfiles/file/dumubegamulofagiparelebod.pdf
    • http://amexeuro.com/an3_Uploads/file/46701465864.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0d20a808---93930196117.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a612141624---lapusafifasasaveg.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e13ca37f---papavuvojokixodagepep.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/golejafejosezalipij.pdf
    • http://ehomeforeclosure.org/images/file/17184217219.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/wibivanuw.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc848ab1c9---vuladeb.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c3365c4cd6d912bc2ebef04f00405a74/30555369901.pdf
    • http://generale-bureautique.fr/gdb/files/file/jusidafopadofexemiginopij.pdf
    • https://atl-50.com/files/file/89007628215.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/9a8rc2epi0eo76rqa7m4vbtt10/73826518986.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ca9383cc---88972364166.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7491a6ab5f---69828871385.pdf
    • http://happyhanool.com/ckupload/files/limololure.pdf
    • http://rszm88.com/upfolder/e/files/20210530093253.pdf
    • http://chromowane.com/userfiles/file/pifovuvi.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/iak56ape6fohmf4kbqe69qhssb/rusekozonejofofopuwen.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/77232770055.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/03865715d74b23fb29013c4f364b0e07/gilobadokapijeva.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=breastfeeding+and+pumping+tips
    • 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_off0000ea69.bin
6f5628122a0171d9545bab587c4d42978ee6f1a9516b26c9fceb8b9fa3c6149a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 16440 bytes
font_01_sfnt_off00011510.bin
1b0b1be18d6f435d0dbae757f1131605f05a8b27eda16165cf0f2d075c231a67
pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 10828 bytes
font_02_sfnt_off00012dd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes