Malicious PDF — malware analysis report

Static analysis result for SHA-256 2120fe620cba263b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 22:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2bbe7bc62b100b3bafb02e356b62aac SHA-1: 95cfbcaa5b42f5fc70d8fcb70ca38c69ae6c1be6 SHA-256: 2120fe620cba263b398620287434be1ea79e884d0b4978557580477256a9f8b2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains a link farm pointing to multiple compromised WordPress sites, which in turn host further PDF files. This suggests a multi-stage attack designed to obscure the ultimate malicious destination and evade detection. The presence of embedded URLs and the nature of the link farm heuristic strongly indicate an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d496d7435d---wewilezudemozafekiwu.pdf In PDF document text
    • https://venusnvs.com/userfiles/file/nejulevebewoxel.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/63190575809.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/bddb192acb0892d2126037880099d3d8/5522042081.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/libop.pdfIn PDF document text
    • https://guijek.com/userfiles/file/jeperilekameme.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/7f828a126755e5553e9d9325ba776beb/63138711197.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/12626603418.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161114d0277825---jolebuto.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/zevogi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4123de586---junem.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/85116264148.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a89a663f3cf6dc04b7071883fe44560/4214322775.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/14284026898.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/nusikaxerofaxazupafejego.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d2f24a7c---titerakobofimegod.pdfIn PDF document text
    • http://geotersrl.it/file/58213949200.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/1d583b682a5f67fc8dcc8511274aaeb1/dapivejipibas.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/301950491534.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78674a187---wutamoxofofogixin.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/22mn6ufgb6hlbrqjse6mcjia9t/95496979656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=enterocolitis+necrotizante+en+neonatos+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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10656 bytes
SHA-256: 19a0abe023ce419d32c421cdfb466e3d51370145d57ff17eb4a2c0012b4089fd
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 19504 bytes
SHA-256: 693e6f83edbd76c3fe7d317678ea0407c43265fe8c885e7fb4a09f37b85d781e

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