Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac1688baaa1aac0…

MALICIOUS

PDF

131.4 KB Created: 2021-09-03 21:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1d9ff3ff40304aaf7178f7aaa8ab8cf2 SHA-1: 0580862df06faace012034a66807beb2abf0dfce SHA-256: 1ac1688baaa1aac0adda96d527487e40657441739d2107e559c615f9637235c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fittbike.hu/files/file/65403771309.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37b1828a8---71944108232.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/56177293300.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/79823372817.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/jotaledesasiw.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/83574108048.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/99584536383.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7eb38346---fuxewesememigab.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bc1027e10---tajetivome.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4845d2c338f0960a5ffee0691e1737f9/32979441077.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848091b8bdd---tapepovazedagumaxor.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sodubafofalexi.pdfIn PDF document text
    • https://pellevah.com/upload/files/49455777105.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6953d8ec5---nolidukupupaxetegoz.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c8ce91079---46121032945.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/52337151698.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3uhepp2t7r27h1pievpp1v09il/9303298567.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a312fc12e89---9690961092.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/52qngkvepak8o5esiq3nr9i90f/mofoxe.pdfIn PDF document text
    • http://3asoft.vn/img/files/xuxesome.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/72434502459.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1f890a4b---31118080234.pdfIn PDF document text
    • http://thedreams.cz/files/vewodo.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/51782018363.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/05p7784dqdlkiiaccgq7jfmci7/59342008317.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/c0p81f76k12lq166ol80h6lg40/59436157269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=literary+movements+for+students+pdf+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_off00019cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4E0 18696 bytes
SHA-256: 31b76919a4a884787570a76bbd9303fbdfc6c8f0e0b06adb8c04a24027ecca3e
font_02_sfnt_off0001e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E56B 10984 bytes
SHA-256: b197adf3aff258f7ea450bfe978ba1fb7a30afafb8801cad03135efe8601909d