Malicious PDF — malware analysis report

Static analysis result for SHA-256 03137ca467e7b982…

MALICIOUS

PDF

90.9 KB Created: 2021-08-02 23:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1716fbca832249dc4ff57913d92ce15f SHA-1: c9b87fc2512a78c9ca9fee820948b419e2188d31 SHA-256: 03137ca467e7b9822cbba1052c82214f94f75a20d42554cf85f2d243b942d283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lure users to these compromised sites, likely to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/eod513k0f5eeemledfoo1342op/473094639.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/083b0ea2e35c66733b4abfb1c96806da/14360499359.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/14788257010.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e30abe9518fe0046e3acc77c99e4ba8e/58914645631.pdfIn PDF document text
    • https://medtek.vn/storage/file/vebodilemadosuzalu.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4fd9b542ebe37e0a527e43dbc1769f85/pibopisowuf.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/gofajolubajevexizexomimug.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/clltvtna5hidgt43f6ofm88a17/7931936960.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c45aa57daef8310e8e7e95591a484b3c/bofitubivugitutedufisawow.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/12200333075.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d783899c68d---lojogubefamimukigusi.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/suravoturapibewi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b54d484f73d91605a14f835ec9b9fc4d/45513077845.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/40268382231.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69eb2c5e4---83058361334.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/212615879160e8049257dd7.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/lujajakaf.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27db809fcb---sufebufaza.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99aad2a96---90506392739.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b35750b8cdb0c7d937fe9ffaf63a53b/43652758961.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d279b2cda04a101b3346bf6e81a6f822/fajaxugivid.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/rotidubo.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/74288580167.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc67703a5---gegenudinanufefejilobub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+white+animals+in+dreamsPDF 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_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 10880 bytes
SHA-256: 6a3cc988d5b0ccfa41b1f5c94505bdb0329beb9a3809905b109766b91b4a4eb2
font_02_sfnt_off00012c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 18884 bytes
SHA-256: 8b948932f97a6f4db1c4af776d03394121b34845cf038d6b9cc5737445cc3e5e