Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7a9f775ea3958f…

MALICIOUS

PDF

81.4 KB Created: 2021-08-06 16:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7728e6600bdad2b69ba220d3d839c735 SHA-1: b8581e04868d34fe92feaf7238fad793fd08a5f1 SHA-256: 2d7a9f775ea3958fe982d998da80ea5c4373ccc27a5b42aec2d9b04a1dc6e77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://energooptima.hu/upload/File/60698341455.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076022ed404a---70132422955.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/67619869474.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/38082069006.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/15275237546.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/39f16f16be1b62f7f3664ba760346902/9717867414.pdfIn PDF document text
    • https://o-dance.com/upload/files/75108064905.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/15176554996.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6faab7407e26de98331ddbc8240af326/xowozotudenuvoxavugomu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610999e684c74---76443885211.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/jetanuwevadawi.pdfIn PDF document text
    • http://momsystem.ru/public/file/xelukirosutebijixedi.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/66056123508.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/1054193043.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984a72cfbe2---44069524378.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e44130561---vamoduxatafade.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/r5uhi8cdurrog3gjdlorc4clqq/fufilepuroxo.pdfIn PDF document text
    • http://blatt-gruen.ch/files/15300250388.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609440fc102ce---12443541697.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5o343f200jo3rb3rjuhjfr3i11/4233499056.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f6b9d80d218cbd5fee18862664efef78/mulikefovewap.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b0ed08f1---fekaxonitagos.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/webanafajigaboziziloralo.pdfIn PDF document text
    • http://mamitobe.ru/files/file/38685127173.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/foxuporaturigiwupoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ge+spectra+oven+service+manualPDF 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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 10740 bytes
SHA-256: c3316498d0858c1bb67be39302e3662d1ec8b44c5f9e0ed6ad6b9a3d599d8554
font_01_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 17488 bytes
SHA-256: 22e3e4954a03f0af81456aac8338e5a503555e24336ee94faa79eb7aeffc4a0c
font_02_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1