Malicious PDF — malware analysis report

Static analysis result for SHA-256 85468134f9a30050…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 04:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ee83ccef1f52dcc31510e9208bee88c SHA-1: ac980efe2f8dc9ab732620f8e69faa59e6d98686 SHA-256: 85468134f9a30050abdb6ad9775d64681548dbaf5d6ce378fe86c4ae7942389f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.agot.pl/upload/file/jowuxivesukakusuvurelapof.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130edcf82dd2---71046058860.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/64228415876.pdfIn PDF document text
    • http://polipack.ru/content/file/vosuxigibar.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210901061003.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/51716792708.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/30500215717.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/27674961141.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/24066133621.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/29682327683.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/17603509100.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/pomujimejimakedasi.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/xadelebidiruzizixuviwemed.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/gegiwobi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8ec6817870c291d1c5ae4b4a99eb802d/mumuxeneril.pdfIn PDF document text
    • http://humanlitech.com/files/files/13410025791.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/66693456181.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/zifavato.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/nosotam.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/48f4e15fbb397816dbd3df6ffcbce167/39709947410.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/zevotawokeje.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55f61120a---lalunurodizo.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/nowivumurawubilukev.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/wiwuvixavasodoro.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f9a85cbf28ba5429bceaf591f19e5df8/zalizabiwevubaguz.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/44507410096.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jorexurepefotezor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+android+rtx+modPDF 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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 18112 bytes
SHA-256: faf493640af318a181b1c8c90bc4c7ba84f2e23be6f477260cd1ddbba5a786e1
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10516 bytes
SHA-256: be34269f2a9641beeaf082bc9e9eb6363f8e1d853f0d23f58650e82ef6b52710
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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