Malicious PDF — malware analysis report

Static analysis result for SHA-256 313a706b141b0d6c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 19:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e747ec765ba3be9f44dd1d96179e898 SHA-1: 96ecca443ff4e12c39a2b9f6c91de2dc577fb2a5 SHA-256: 313a706b141b0d6c0fa0b1376cc310d9832f368d2a1057d4ea0d266684fb66ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to lure users into clicking malicious links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/dabajijivase.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e89b3c5cd---19808166597.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/53926803722.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e14d18ad86---zixegubuluvug.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tenuruvenejuropikasoror.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79e7b439d---welaxawixupe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af740837b0---gawosafefanabupugajaju.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6012d8662c---9990451108.pdfIn PDF document text
    • http://saktigroup.in/uploads/1964981829.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bd9943e1---10134593887.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/27677552748.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/ziredijilatu.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/19806259322.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/31369964286.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54885799302.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee050862667---3993594311.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/jafuponatik.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/81847304607.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/29423817953.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611f85541e80d---luloji.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/vupepeze.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489e056f1e---23113046071.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f17d56a3c3---59547885077.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/remetezoguditewi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc43938dc---31320424299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=derechos+civiles+y+politicos+pdfPDF 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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 18576 bytes
SHA-256: 43d399108d85f9584677748fee6782836f62825b05b316076dc1980a17474817
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 10632 bytes
SHA-256: 1906816aa3b24ec398678a092f9a485ac056731ba6ac166ec4bf2e9365e142cf