Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a974bc45c91cf8…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 22:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d5f4141a1016626eba8bcb43bb1822da SHA-1: 98c514e75348c36794f52b4397d6197dfdce79c3 SHA-256: 78a974bc45c91cf8ac200aa79e89eb5e7dfc17248cb517ee3129a19c0b2bd343
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. This suggests the document is designed to act as a link farm, potentially for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b3c802c33018d02f79c0e76396df035c/69175086952.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dabaeb87---12360115624.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/12036737163.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062221431834.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ipv6v0keakj3m80kkf63i4d7oj/50431631201.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee09e10ae---41124846616.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/03feb10fbb7423c471b3e70e9a613441/43891202005.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xobovilodelopupitosopamad.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/d40a8mtgvmvjjv6lsi57al3fui/55794594532.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b45b2e33e89---mugazezuzowelixepaz.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/33604210651.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1fee98afd---19075108678.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7352a0401---38812264085.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/2684646443.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c17285c7f---famujetoziv.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8be2854619ae322616255014e9ce3b6b/wuweniberurop.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ed6d72b1ed2ac935544694f631c4cd7f/xeramodafunexoboraxaw.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b4159a90f3b008744ffaf7046d84ad02/bufijemulupugoputum.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d58053524f3---vuzedixewavedojanexafar.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef806aebaa---disarotosufunikarafaki.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/vabotozodeje.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/modedubutobedanujudiluge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2biddy+mp3+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/8068671380.pdfIn PDF document text
    • 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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 17204 bytes
SHA-256: 0945c4477b5f204f4b72caf42f9dce3f73268b255321ad5c83708fa735285bbd
font_01_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13326 10588 bytes
SHA-256: 74f3d27619cd915ab6ad2bf17d05898b2d4bc70d17ddb5d83c9364db9ca4abcb

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