Malicious PDF — malware analysis report

Static analysis result for SHA-256 c072da4597767eed…

MALICIOUS

PDF

94.6 KB Created: 2021-07-07 13:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b7de5e5d556daf9757db8b7c372c039e SHA-1: 53b114810cb89032ad36147148905898ee760361 SHA-256: c072da4597767eedb82191764a5eb47aa5ef103ee26d609079607c4de6d94ff1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/66fd6ee67b03d5da5666cc4071e60a9f/dasosav.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc331c882d---mujamerudapadizuwoxi.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/lozalu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/xasidojemirozaka.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097a1419a752---67539171380.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qo58cmk76emr1q6t7cf0t64s50/32634703981.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/13048116151.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/36268643089.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/bevemozelibozejajiwuwo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160716e1e30166---vesumegowex.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/979a0db8b9ac3d4d07fc623151fa96aa/wuxinarat.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/40049336056.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dng1adjhvvb15gkkr2v2p5ecn8/56019687275.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6da1a64e6---904813252.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9403a86d84ab45b3795fa830bda79f65/56318065797.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9p0j8qlfqdorgbe430ecnv070d/badoxafojubijikojadidifo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a861d7c7d8---kifanuvilunibagipot.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ae9d0a373504ef5ccff613ba42905130/47734601502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=transgenic+fly+virtual+lab+worksheet+answersPDF 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_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 17712 bytes
SHA-256: 27dac39c18ce17c2a2604a559a4c6c93da8473fe71908e36512119d075c6ad99
font_01_sfnt_off00013b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001532b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532B 11176 bytes
SHA-256: 6bd53df865c6454df8082fd474d2b7e3c8ef20e229b79b3266ce3a4dfba0d2b2