Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19b38fa2d73c830…

MALICIOUS

PDF

85.9 KB Created: 2021-07-06 15:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0becea667fb9343e89111d09bb280b33 SHA-1: 376b2f78fa5d7d2eb953e68bc3e351af6a9eb717 SHA-256: d19b38fa2d73c8303308dcd8016483649d2238413afa2e4c1eb727f01ea87d50
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or SEO spamming operation. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90cd99fad---dizoxabojurovezeju.pdf
    • http://uptownchantilly.com/uploads/files/vopogasenigute.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b456497983ba064a85b0efe884f41e9c/momixape.pdf
    • http://szolnokepul.hu/userfiles/file/zetutisozifowavup.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/21abe3ff1950b976cd77349ef01aee04/64014015102.pdf
    • http://geoodwierty.pl/files/file/42611121994.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/10693759c1e002f6894a4741f04af8ff/sodonitapiko.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/lulovesifemuvatasi.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c322b6140a---85249517722.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/43648e653a6f35a27bb64466f59bd9dd/biviwilobefoxejapuxiriw.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/87670187eb5c96f2447aa4d7ef3e8744/repoj.pdf
    • http://hysansam.com/fckeditor/userfiles/image/baburexa.pdf
    • http://geoplan.su/userfiles/file/13629989811.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607726a3ce20f---11570172917.pdf
    • https://kodcomputers.ro/2664/uploads/47445421839.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8198669ad---55265778522.pdf
    • http://marta-galan.com/files/varios/file/12298329245.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mic098cp799ul2q31302fh2cu0/falisikatixusafoxan.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7f0a2a420bb25c00789f619bf10129ed/89401493671.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081e1b5e9f---bemibuxatanewabufuziv.pdf
    • http://kayamedbursa.com/userfiles/file/1188104700.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160977ff6943fa---34978936708.pdf
    • http://www.colormotion.cz/UserFiles/file/xotule.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76da1eea19---42641034953.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecbe6c009fca97bea895389b2a912646/65853887704.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=low+water+pressure+in+tub+and+shower+only
    • 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_off0000ed02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 16792 bytes
font_01_sfnt_off00010514.bin
b8d84b8d042d868d9f78224bbc86d7771dbd78c38e801e7e80747b2a9cf616aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 16860 bytes
font_02_sfnt_off000130bf.bin
a159da4a62842b24e26c17b62bb4e41610672752e2fb5dd94733cd79b03b888d
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 10884 bytes