Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb43b0d13a76473…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 08:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c760a602b7ae1af693649d919c377805 SHA-1: d35ed7f90bc596633e9d1e248f1fb2befb22f375 SHA-256: 4eb43b0d13a764733ec92f2d08af16e2dcca115a94533ca0328104f79a859453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://thai-airpark.com/ckfinder/userfiles/files/satabimokisowekux.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r4hdso4kd2e2vproh16o1gerf3/42349511911.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c24d1676---54543720623.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8ssa1crfc9srejedg1bks394q2/lefilomowofezukudiweruwuf.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0b8b675df29caaf4b898b6ae1952264b/loronosigeritawenawa.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/39044668999.pdfIn PDF document text
    • http://rc-modeller.se/images/file///mowuwetulal.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d7bc7a8d8---pelilavolizujaxi.pdfIn PDF document text
    • http://fxlcd.com/upload/file/82655239607.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ece755b19890f544c99ab76ae580653/jutenumejisakuzopevizumu.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/33977979135.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f35b3d89---wuzivu.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/fexepefusi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/14121264316.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/50580955898.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/nalelefeg.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/185ljg7jkq2pi04kqabp9eeb3n/sebigokezoxom.pdfIn PDF document text
    • https://termoformat.md/img/files/duvebibefawufeginujux.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xufez.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93daaca46d476b73305e0131fc95854f/61934663108.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097257bbd7a0---75390827289.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zopagibikadanuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jacuzzi+rooms+near+mePDF 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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 10400 bytes
SHA-256: 958944c7a534a1ebffc50186bc6edec9ababb32a196dd96aeb882c296c79b0ca
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 17648 bytes
SHA-256: 9c802a1278086397c3a1034647fb711b5fe2c9a149f256b4acd630cb4fe1da75

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