Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ba27a8b5d88eaa…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 13:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74ae697d4c06a2e8afdb38ce94ed9ecb SHA-1: 5d9c9994ee1d909231b039a80f4f6b5ac6ae5663 SHA-256: 82ba27a8b5d88eaa16309a0a82239d40c6527e8b063fa0aa7b9076e5fa23ff3d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The document contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of urgency lures further supports this, indicating the document is designed to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=red+robin+allergy+menu+pdf PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8befdc14cd---99846548495.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/69587476182.pdfIn PDF document text
    • https://ketoandongnai.vn/upload/ck/files/93748397097.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce73ad962---rizefaf.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c02debeca---37920042826.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/222f648ee45982f99ff32ec6aeaf6661/pozoliw.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3e9601a9c7eb09b70777bec462b990f4/jemolukofezemupadi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/lulatazo.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/82161342347.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e8574e9b60e---12499757939.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lonusurupizikuzikar.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/46651566265.pdfIn PDF document text
    • https://123natura.com/stockages/files/2310225792.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610648360a4c7---mazutupoxofebobaxidal.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/38406768033.pdfIn PDF document text
    • http://freetds.net/userfiles/file/10178363339.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb4738900e---22604077335.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5f8u3coa3mr3h7egjoa1lhv8gd/99106180661.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/415sl11uhnisel6klt82fo6kj5/63654984264.pdfIn PDF document text
    • http://aven.su/userfiles/file/69787455479.pdfIn PDF document text
    • http://tion.hu/upload/file/xebikumujaxuzad.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b0a30f81---pefetojizexuz.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/pegapomixevaxux.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/h36pqvsgn5d2u9k7c992vdlgqd/86174411134.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_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 18728 bytes
SHA-256: dfc351f7e862af72f045f06252fb927984600d9628294e71ef69930dc89ac6d1
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 10976 bytes
SHA-256: d1ba830c1eec0b80fe6ed94ed517e83b1b6660f4b1d18a24a842014119810321

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