Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d0c2f4958d302f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 07:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4893a601dffb8f59c2ab80cfe9006c62 SHA-1: c169ef89e73aa066bcc8e51b3eca860402eef982 SHA-256: c5d0c2f4958d302f7924372ea7f26c466fce2bbce6a7a25d28afbd37623d8623
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content via the provided links. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=unhinged+free+online+movie
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae59497a4---88913374486.pdf
    • http://skpizzasubs.com/uploads/files/30889499729.pdf
    • http://kientrucsangtrong.com/plus/files/xexaj.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f70e7c91a---lupobegamizisebixuvito.pdf
    • http://americasbestmanassas.com/uploads/files/zenuwanubiliratadogotirux.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138460426dde---mavemudu.pdf
    • http://www.urbanwaterways.info/files/jizero.pdf
    • http://baovethanglongmb.com/upload/files/10397308847.pdf
    • http://mudrberanova.cz/userfiles/file/82587346656.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/kedibalidoxiz.pdf
    • http://211.129.1.225/system/ckfinder/userfiles/files/75475137244.pdf
    • http://hanlacsclub.com/ckupload/files/vuwavekutezinadajilirif.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/40588377414.pdf
    • http://dpsszczytno.pl/photo/file/57412188288.pdf
    • http://pphjako.pl/userfiles/file/wusigojiniderujegener.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wugisetuvarajelomexe.pdf
    • http://builderall.info/userfiles/file/kafofuxivege.pdf
    • https://akamercedes.com/images/uploads/files/lomupaxakuxige.pdf
    • http://radio6deenero.com/uploaded/files/jufutulaxezanamo.pdf
    • http://residencelesaline.it/userfiles/files/bebapotaz.pdf
    • http://xzass.org/ckfinder/userfiles/files/dezaxubibogobirabijoromeg.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f6b4ef5a969d678d6988ef4241b96906/jamirikeduduvanimuzube.pdf
    • https://bitree.com/ckfinder/userfiles/files/85497085909.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde5.bin
d0885efd1b8efc442d14aa1d58451b63d692c7843e3468e0134e09ccc0b33d88
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 10444 bytes
font_01_sfnt_off0000f515.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16792 bytes
font_02_sfnt_off00010d27.bin
1a6d0e65a1e0c2d6daf397ac1839505a7703f6d9fabf4b8531b23b6dcc14fe8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 18796 bytes