Malicious PDF — malware analysis report

Static analysis result for SHA-256 565c666fdfa0a474…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 21:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52a999b295607cd5d9d9783b445133ec SHA-1: 0c32de88008f9232673b0e30b429b7f400c912fc SHA-256: 565c666fdfa0a474736f2cfd21755db4905770998ab757de2b3a525c8eff037f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609297b41f6a0---14069040365.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0f2f17036fa7af44a2b06827eeea36c0/38930308756.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/26951619765.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5175e2b1751e8098055eba0517c6f68f/27519530742.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/kadapagokukifoxiwe.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/l5cjvrf05ntvptdrdbk0d55206/sapelomakujajoserizazo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/53602820594.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/94156971069.pdfIn PDF document text
    • http://computerdoki.hu/user/file/gilafabosalukopifisin.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ktatlona2k9tirf70rg2v81nn4/gogupexogilujemenow.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fb8f791a9ad29cfbd451f9eda200a9e0/pajaruji.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f64f5f1ba---94063184085.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/70881128389.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083537523836---29659758284.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/95319422699.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/tizafevibumojujikuwi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/838f8767846fa285aa6e35f45d2589c7/99215626255.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wasepumavazugupug.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb205a931f---doxidejaje.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608387cd6c3d7---gilebitosamibufu.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/57037034303.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/gakosawedutupe.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qufnk7jm2c9b7d3ph8fusr73te/35603937919.pdfIn PDF document text
    • http://davcpundri.com/css/file/lolurabexonon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=epidermal+inclusion+cyst+home+treatmentPDF 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_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16188 bytes
SHA-256: 92dd1824ea2b5e215fe5300a9ab2ea6509a3c50add890ccc953a61e686fe3779
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 10976 bytes
SHA-256: 4bae07cb8ee455a234e7f9ca1d3b346caf80b3b0da3d27fab447242501072adb
font_02_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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