Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5077ebd4c4ea62a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 20:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b52f5b15ab21126dd3ea630edf9da36 SHA-1: 7834deb1b52623bf8e87e0ea5dbe171db41a1d09 SHA-256: e5077ebd4c4ea62a31e08cd805c8b5823e3e430efbae20b7a31b1c9166c7c624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it with high confidence. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://queure.ru/uplcv?utm_term=best+android+tv+web+browser PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143e527dd272---dabegizibupukiji.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161486f2221fb5---65384446098.pdfIn PDF document text
    • http://csp.hu/editor_up/rixari.pdfIn PDF document text
    • http://fivelscope.net/fckimages/nisobodajujexaxusa.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/josituxodobo.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/furerenexitu.pdfIn PDF document text
    • http://prograsifkalip.com/files/85890309588.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/58031061499.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/44624872678.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/ronafag.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0b7f8828047a36f35e1074ac476c356f/ripom.pdfIn PDF document text
    • http://acelybio.com/upload/files/41881406768.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161405471bc8d6---tuxadelivebutefivoluv.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/65319852674.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xexojiser.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/45391235523.pdfIn PDF document text
    • https://ijp2.com/contents/files/41969069878.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614c19cf866d9---leludiwakelomepojalesivi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161331f090607b---10315175229.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/pumavufazuzataduroworiro.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/90552984380.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/30991866987.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/kujewaxofonaru.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/radubuveget.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/60272095507.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/76335885891.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/lofikaf.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_off0000b69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69F 16116 bytes
SHA-256: 325893898922d6ef01cc5e486b937b7f9065860a3ac204c39062cf5271eff067
font_01_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 10540 bytes
SHA-256: e62acb498b7cb4cbf8dbc8a04e41a47e0e26cf1ac25b4c4d6d14ceccb4f54607
font_02_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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