Malicious PDF — malware analysis report

Static analysis result for SHA-256 424180b8137dcff8…

MALICIOUS

PDF

89.6 KB Created: 2021-08-17 03:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d2a98f1519814e17cce261d7e47016ab SHA-1: fed9ff43043636f260f0643d393d6a5a04292555 SHA-256: 424180b8137dcff8e530fdcbf3998b53e8a084ed71a3d6db2d9539e9522f4c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites for further exploitation or phishing. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

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 http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff3f41a67---75842548246.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f9ff1401---2796310989.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e9439784e77---savakar.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ed5a4a9b---92477860843.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f9232160b---32548445964.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/korimawebajuxejo.pdfIn PDF document text
    • http://bociany.sk/media/file/xofimorikeregiz.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/51144291701.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/cb33a5fe59192d0ab3099f7b43ca2bc3/2106169378.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/zupusofebimivowuxumid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eda0917f39---22577611795.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/lalosudemigeloxigulu.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/44722400832.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996270e5d4---50964638721.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/664c2d94b1d7a5322fcccb7193ee5488/60423883141.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd08619aa6---61971198448.pdfIn PDF document text
    • http://teplospectr.ru/images/files/57295405246.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bcnojiforttljokvqr89od4g4i/94736204927.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/22974532560.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/duvemepato.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a193c626---82897078936.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/411888ca9a773c75a8f9845924aa8c6f/48964688257.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/gasemitapikexaxolivodo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c72f933d670c3b0fc62095ecccf0d171/bibiritakobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=are+there+bts+albums+at+targetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 20308 bytes
SHA-256: fdc6951b0f67fbd1b457e7274b1d4fe21e62ac5459364b31abf7ce4501ec7300
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10460 bytes
SHA-256: 346b0cd0c7e5350295a048f0c37bf05e993d1b96f344e08efdb3f0456fe6bc78
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16700 bytes
SHA-256: 263fba459c43ef75c575ca363a77cc798276f4a347a51b0e06021682a2b3c25f
font_03_sfnt_off00013dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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