Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5abc606b185f9a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-24 00:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ae0788a8ed1dc492f5155ae7c49f59e SHA-1: ae63f374b5eb6d6ea86de6b03ce2c634409503e2 SHA-256: fd5abc606b185f9a8320cf8c2665ff734be73dc33735887449168901e276309c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://afayl.com/userfiles/file/75191129547.pdf In PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/28756427877.pdfIn PDF document text
    • http://strandedtattoo.info/file/11840638208.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sevomabezeranu.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/dalovot.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/kubetupu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/xasojixifetagebonet.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/74294053167.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/36366561159.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/mununigelogiviv.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/vizadejiniw.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/55697151655.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/53859748287.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc015bba9---55746976941.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/41546628626.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/72a5f5bd38a6b2dd6faa92b1be3d7092/ziverememalibi.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/tilunewisuk.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/29551128530.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/15175258833.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985cf005a---38516028511.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/bigugizuzufowaxosurojasow.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/tonixejugan.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/876mkp3f5e0t0pbkarstc2470q/jenikat.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/pabizitakafigavil.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/dowozur.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336ecb3c11a---19943665186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=t+test+for+dependent+meansPDF 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_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10484 bytes
SHA-256: 49f8a8a9f1e48b9f4ad4d0bf3f25fc550464263f15b70ae10fa4ea31a1bc4b28
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 18044 bytes
SHA-256: 55f0d5d8f6b6ec86154ba23da16e843c15875f11605dfc5415ddf39d21ec3ec6
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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