Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58d1cc0ef11c8ee…

MALICIOUS

PDF

101.2 KB Created: 2021-07-24 12:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24a6b9e1f26d1f344d1f12aa96b2cc9f SHA-1: 4ae5283f4188045e7be13032332a2060560c8407 SHA-256: a58d1cc0ef11c8ee206b840c552ca53c9111037c8fb4e101f2697ff5c160cb85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://sushiloverca.com/uploads/files/64736289408.pdf In PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/febozurulasamewaj.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/50475865511.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/99609299853.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1fe6e01d83464a0743cc968f30db420c/zowono.pdfIn PDF document text
    • http://learningkey.org/userfiles/78919679669.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df82f913ad---45551375671.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/dipuxawe.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9eo46olsf98bgkjqdlv0gar4g4/vevuleboj.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed5bbee45---89641763849.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2237ac4fd0---sowoziba.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/soxitevibize.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/62080579386.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/54567951195.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608087105af9b---tekisukalekubuta.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0183fd82---56976588058.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/40961875785.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/56785376065.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/verejilobemunepupixa.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/bativatuzodudoxofafafatu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082e524983c3---kelaxuzurikal.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/55882892974.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/59813040439.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f56496d6e---xerumufomuveguxeligi.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/29110621218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=%C3%A9valuation+lecture+compr%C3%A9hension+ce2+1er+trimestrePDF 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_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCF 25064 bytes
SHA-256: c245e41f0b7690fc6e7b868532151dec1307ab77d36200d0f46858bf89e857dd
font_02_sfnt_off00016b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B11 11128 bytes
SHA-256: 55d018e9983ec412f530ddc1dd14e69b8ce34f19447c33a4040f24c090852ec2

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