Malicious PDF — malware analysis report

Static analysis result for SHA-256 755838292c358e0f…

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 18:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e28ce3c10c390dea3aa0724976960dbd SHA-1: f7025a3395ae4c157bd6cbd564c2f3b2e5f19551 SHA-256: 755838292c358e0fcb2294d086ce3a2adcedce001cfa4a9423bf8b03c065032d
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 and other potentially malicious domains. The primary purpose appears to be directing users to external, untrusted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f488bd3d16450be0003d1093298a36cc/34236916227.pdf In PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/21951748983.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/xebeguwuwaf.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ce9df12a---redepalodezeniv.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/robekutegakunurufazidewol.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8833oe7mjk2c2o3hd0toddr1si/bafad.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45b7c6b26---pagukemupozajixaki.pdfIn PDF document text
    • https://inncredel.com/uploads/wopefenazejobilugabezipi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d5b2aaec7---78526239836.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/14032671976.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/motenawamavuxo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466d09834a---gowosejel.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zaredaganaga.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/puvetirawejorowez.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/sagotob.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tugosodibufad.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/a31dd1ec887fa0b6eda20ff7e8ea0ac7/20545400582.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/450580de9e4e4172570791c8b400f4eb/losupudopawita.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/438cbfb771fe6889bbeaafea576ab8e0/baroluvaxixoxavit.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/64233628023.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/80343446585.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/de082411f82ad9b5033462385f5672db/98132218060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+love+to+tell+the+storyPDF 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_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 16656 bytes
SHA-256: 66e11399e85bd2e03c446a28e4ccf8fcbebcf306ad259659d67256950c89d9a4
font_02_sfnt_off00014460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14460 9980 bytes
SHA-256: 914cc220357dfa168e6d3cb8994d9badfe59fa916deae914784ff338b5f6ea6e

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