Malicious PDF — malware analysis report

Static analysis result for SHA-256 27788d87e5d04aed…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 08:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84119b1ba273445a0e9b7fcdb52dce91 SHA-1: 933f20a643c2f55809aff63eaef32d3d4fc580f9 SHA-256: 27788d87e5d04aed5375e8d150994aa50850b75b2f1240b75532ac75e9f9f37c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2f83aac0f2239bcc2efed61cb42035a5/finive.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d759747b44---72821193140.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/51510378153.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/32915106934.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/06197a0793d345d33e4481ee27f106b2/65199318877.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/fesavipadidurusafogewatut.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf7ce307e---tonedeve.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/mukalapomapotigoli.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af40d5ae690---56790489366.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3e0fe8f7e7b3266e7ab67ea9fd049be2/wotemamubezonove.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/37242727852.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/79400311972.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160be7196a9595---78333801464.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/fvdkc11pakkt3kj46aqrubjnvq/zelikakoloxupekeruwoxi.pdfIn PDF document text
    • https://jobtiara.com/files/files/lirufisotusi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/00fb8ab6c982222b0a9626628dcbe425/61258170669.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8a4ec5f76bbb2efc0621732138988705/xepexopotebidik.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9ea0ea5155948e82255b3bf62f99dcf8/3840846811.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/96957621567.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/darazagakaguseba.pdfIn PDF document text
    • http://hotechike.com/files/files/91508247261.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/78853422308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=imam+e+mehdi+urdu+pdfPDF 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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 10276 bytes
SHA-256: 86e21343aa04973eed89ef07e3d3154399c9ac03000f7351a996d7d4d28872a7
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 17580 bytes
SHA-256: 7314074a4f0b400c99fe34bfd1833cd40d7e480c47e230c6853d7a426fef97e8
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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