Malicious PDF — malware analysis report

Static analysis result for SHA-256 57450c0128350f17…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 11:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9677c414c8ae5b8781fdc718fec27eeb SHA-1: b920a00b627af6c0ee099a9bb21b68418e1c66d7 SHA-256: 57450c0128350f174bf9f1613eb249c27796f3157c13ef2675cb9f0bf811788c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=unblocked+games+rooftop+snipers PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134b02b11c2d---lapamifuwadefejogusosor.pdfIn PDF document text
    • https://tomas-music.com/contents/files/61035112399.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/39012778281.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/62251798126.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/87423711839.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ebdbce000---jimexaresotefowikevololor.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/nukibap.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/36337920458.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091902522173499.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/80520843690.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/79489356092.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/51215069993.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/fopug.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/zogozavugawebomadu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/16a181dce1e607bbd7f488f389d71fc8/fisowubudaxod.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/jirumizerinubewux.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/toxebatajovujabixewomog.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3e2bd3c7dce2a3733c0fd0b523fab82e/64580017207.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/5894549252.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/bulajagepesejasazalav.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/gitopagajiroxi.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/15511106952.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219202036584366.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/powopaga.pdfIn PDF document text
    • 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_off0000c125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 18136 bytes
SHA-256: 8dade8b03dd9ca535f51d5a03a68c7fa813bdfc3f4062cc9c3fc4212b7d185d5
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 11204 bytes
SHA-256: 46926e6d520063830169eeea982f1057aafae0201863ececcee1520b7d008233

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