Malicious PDF — malware analysis report

Static analysis result for SHA-256 561e8eb6fc73c908…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 20:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edcb0ceb1ac8c66849766a26e146a2e0 SHA-1: f586e6c56895d0f48248ac60bd62073a70520539 SHA-256: 561e8eb6fc73c908a7666408f672ddd41e267741830da25b64878feae89d292c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://luatsugiadinhviet.com/upload/ck/files/53295178302.pdf
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/25521813391.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9dee0450---texakoserurugadafevixe.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8e3ca432---kudejexenope.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0f719194---33531794458.pdf
    • http://artikos.pl/userfiles/file/70249189663.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vonit.pdf
    • https://travellifeafrica.com/ci/userfiles/files/guzul.pdf
    • http://www.addvanceo.info/userfiles/files/47297964251.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b377030ebcc070cb88fcab51d360a5e7/90078529275.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/e7kiraiing8fbs0n59793qlltg/23991521140.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kv5rej8ieb7i5rp9ogi1ocgvme/sokuwesi.pdf
    • http://appartementslisa.it/an3_Uploads/file/34693390720.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l0dvb1dr52tiom6hmqia32ke21/71819825432.pdf
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/1502642277.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a95897c40---nixeguporatapakujidebupew.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a814ce18---83992592011.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/q1jeomoq87s978j18r544p7091/31295257590.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9b0e6bd2508231501c59bfe358c85a93/31025026290.pdf
    • http://csc-0411.com/userfiles/file/20210810064936_9mavum.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93344778c3---76696128269.pdf
    • https://tsafar.ir/basefile/tsafarir/files/41231832000.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bac3f196---balavudupexofodirutedu.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/18833630367.pdf
    • http://sameiroeventos.pt/ficheiros/kiraj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ahima+standards+of+ethical+coding+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_off0000e5f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 16792 bytes
font_01_sfnt_off0000fe0b.bin
0bf9fc3b6d64056f6e5dbff8d9685dd288cc3e3a02ee91e863e4097796d91868
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 18648 bytes
font_02_sfnt_off00012e5b.bin
95d4bffe8d03647d306f684d99376121988ca86456c0c4037fc1b22c89ac5226
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 11048 bytes