Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a17c6b7d1e210c…

MALICIOUS

PDF

116.8 KB Created: 2021-07-19 14:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e7442daeb3863d6b9e1e842adb7057bc SHA-1: 6eb25ee5260ca959557a77523e161d38f5e1aebd SHA-256: d5a17c6b7d1e210ca460c3b89e39f3780d232805268cd67e7d4457b13d977bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content hosted externally, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072745f48402---30458604075.pdf In PDF document text
    • http://transcash.com/ci/userfiles/files/38947948650.pdfIn PDF document text
    • http://tano-cable.com/d/files/85871688800.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/mifozevobodakabu.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/78558350349.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22cbd3e5b---37907725406.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/nivaj.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/53952268730.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c0a95c757508e9e8fee30fd3fbee7261/88593533520.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/40372459780.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9mgjkmaol4sli4ls72e4omd35g/gupabisi.pdfIn PDF document text
    • http://biosite.ru/images/news/file/34880138535.pdfIn PDF document text
    • http://daydala.com/userfiles/file/jovixase.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/88018eb0336984f74c69e23778b34f90/13407626983.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/20826870657.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8d9383bd0281d4c6b74f4f4479524a03/10152445637.pdfIn PDF document text
    • https://vestol.bg/files/file/daweri.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2c3280a02121d2ad02d1a782bbb5a092/dasuputixuf.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/fakulazujijamaw.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210706/file/1625502306.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95c0d5b68---saropepatuku.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab6998b54---dodusadebefalefufel.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/modunuputijibijir.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6390aal8as1f4cpss0rpgg0pdh/mojavo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8b2da60b---gifugerobinapodozom.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d07e7609---nosifefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2nd+order+differential+equation+non+homogeneousPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C9 19912 bytes
SHA-256: 7d968bf0cbee77c00260b75f4c09fed40b73ab644c615db581fb65d315e31409
font_01_sfnt_off00017e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E6B 11068 bytes
SHA-256: 063c80431c531203ad3ea08433dc60f5c8d8807cf966a580f7a5d1019915719b
font_02_sfnt_off00019784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF95 16136 bytes
SHA-256: ddaf406db7dcd027777cf157fae23d9923176fc847e75eb443ad96055333e8cb

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