Malicious PDF — malware analysis report

Static analysis result for SHA-256 80973fa56f1f72a9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 08:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f21cbbdf5d8e235347b107558177820c SHA-1: e98ca8676f3e1a7eacfbfcba6e8429db9328adcb SHA-256: 80973fa56f1f72a9d2a59e0b90ea35c7a553606ca9ba73b2ed5d9139e66b592d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d04f422d5---gexunokifisililiviguro.pdf In PDF document text
    • https://kham.vn/userfiles/file/zamopefepuzekakibelu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dikavokagidebaz.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9f648b01---58657006760.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/bd83c60ae647b31d978a4c5ef8db4901/26107516615.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/89868301443.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/93535938150.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/gasubikidijiruduguw.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5c620197---90620640759.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/05honm9d406dcpb6an79i6e9cn/runuviwixujisonusapeb.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/saganixaravisuzizavafi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4c3efc83---rodowabogevurixitunel.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bitiwofexeraguvebenokos.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7272fdcad8727b2bf8bed45c31005c02/judizekagixegusupi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/455ae2d4b73af50e8f79b7b33160a34c/jikosufilinabusamot.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/silozivumujogafoxofob.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161243a9a6a4d8---wivotubafalawedurezar.pdfIn PDF document text
    • http://dsagco.com/Upload/file/xalagefogebejuzozow.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/majibetulonovanarivirese.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/71682435867.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/pugilopivazasumagofeba.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/55564077524.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/58423014772.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e68ba63b4---27363953098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=french+kiss+animatedPDF 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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 10536 bytes
SHA-256: cac24a0edb92d53d78a5a14536f99e478c991ce473610ce02026006c2f6cd785
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 16300 bytes
SHA-256: 1d51f3e773aebe8ccb6a01e16f9358518eb91cbd04231000107d36979f83319e