Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f58ba0603d02f6…

MALICIOUS

PDF

96.0 KB Created: 2021-08-08 00:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b090d6829b3c366edec8e891a6e0def SHA-1: be74719a6545f420871de54cf1c481d7761570b3 SHA-256: 77f58ba0603d02f6cf37da0eb11ac6540c3dd715e1efe74070a06c044ffdd381
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a48cdff2b60---fabimobepasuvugavo.pdf In PDF document text
    • http://teechart.com/uploads/images/files/24784868913.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881df5da0a4---63792733729.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723bbbd3816---rugonaseveriwa.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/ledegejilazojevigezejat.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a90149d1737---jolenovonube.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jusovunof.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/kuwarepat.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becda8048f2---25569708021.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/phomrg408hdalqvhjbgs9adrko/tesuliru.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/99226292978.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e92ead93---pifujevemej.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d13dfb390072a86a58e204b615b2a9ef/57349220846.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/sijezopukogesegelibiru.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/nobiwosaboro.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607476668664f---bisigiwenabitokoni.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a5fad5198ed2788cc5a269754064e30b/dizisetogotuvezazafag.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/50c25d4ca063be1e58a5b9375b043bf3/sesukoxomidozabiferebare.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/ragezutufu.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/7849570092.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hmhatfl4v59u4er5qn1v3gk6m6/80362990079.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aec1df2460---94043610046.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/47f90498df62d8be4e8cc8e61682d62d/68236766467.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/xaveronizabazuzomuje.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/65281141020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=desbloquear+conta+de+twitter+bloqueada+pela+justi%C3%A7aPDF 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_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 20368 bytes
SHA-256: bab8aed8146bbf7081e043d33b4b66c33a99da5e6af58856cf080cd598baa4f9
font_01_sfnt_off00013d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15561 11308 bytes
SHA-256: fae7252126f286fa79bf282171a8d1e22eab945cc07d8b35afd9a9e1a8547fee

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