Malicious PDF — malware analysis report

Static analysis result for SHA-256 78443084a408b607…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88b591ace6f492a48f7cdb98717e7bbe SHA-1: 19c10d252ba58ec7bd38d8fd19758eb54e1f0859 SHA-256: 78443084a408b607b2eb4cf7e556cf93bdbb43136ebbcba2f7bad641a0d39e09
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised WordPress upload directories or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to lure users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://185.33.116.145/~acus01/upload/files/wakikopeg.pdf PDF link annotation
    • http://mai-colle.jp/userfiles/file/94089468772.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d420818b---gegozabiruwixibebojodas.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210902025753.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/gajezifafodimarixil.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/lepelowutebabeluro.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/lafuni.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/71290458457.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/lozad.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/baxazarakuxodezapigirate.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b8820069---legifoleruzate.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/wevusesexasivokexib.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/fosamevaderunasajisu.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/tufawadenijinoz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e34e2f0a---35331622529.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/tetuninofatetitubobagani.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/10264945188.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/mefujonojavisot.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/rekalijuligoxavab.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/40464301514.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6f3f16f5---96017721645.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/nusojovewukupejor.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/favodakogog.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tumopesemoseb.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/tegapatuxozovom.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/penubirinekadakadup.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/vakup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+a+moving+wallpaper+on+iphone+8PDF 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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 10884 bytes
SHA-256: df83094ca232021530bdbc7141d70294bcccdc0e55beda05fdc24c7484268423
font_01_sfnt_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 19168 bytes
SHA-256: ecf86a89c263d437bee154fa81d9f590550f489f2378b476f24400ef444e2dd7
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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