Malicious PDF — malware analysis report

Static analysis result for SHA-256 74daabbce910ccc1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 19:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a4c018eaa81109f157cafd1bcbaa7ec SHA-1: 488cc9d042f010f5286148efa71de129fef00f12 SHA-256: 74daabbce910ccc1070d2f7e32f7acd0a6d63513ca97858ff684c7e9b40e1253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0f164ede73cfc06af1f5ea0442c3aba4/7764103715.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/53365508530.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/2125936968.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/72501604342.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d388dd4f---26557830022.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a427931b29---42299005619.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/gegetomigupugeve.pdfIn PDF document text
    • http://mqskin.com/luutru/files/51832091857.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3c48a3fe41701d5b3e91f20c6226cda8/80776053632.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sojasudonemubesazixekiz.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109031256228237478pejkg.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/maderutododuro.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/22196625864.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/84029645631.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/fapuwak.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/86817237727.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/34854279241.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/52699549157.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/javonelavofikuwikod.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/valadomuzab.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/79691209255.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/wosotuf.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/65146146723.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/68817894036.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/50765763633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tinkle+story+books+free+downloadPDF 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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 17568 bytes
SHA-256: 58686f58c78bb766dafe454fa6bedc6f106f34f9bb69a29d9ed3270c0381ae12
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 10744 bytes
SHA-256: 48daf953c1fead5c3dcae7c30067209ae4af8df3897a1891dd256acdc18bfcdf