Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e13cddcf2328f15…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 20:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 265c78501c1ec2c4189edc4c9f0d9cbd SHA-1: 7a33d5e89f72510be78d916efbdb7047529911b3 SHA-256: 6e13cddcf2328f15b6dff12942d1f0eb274131c0794a11e2bc703d1240b57836
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress upload storage and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites. No scripts were extracted, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://varadimasszazs.hu/uploads/files/zonosuzogaz.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc70baac6---gokavidogarona.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/415a983d74c65748b5f0ca57b95a2a73/13218285618.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/fibevemodejirivazine.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/jigusapilelowanagujaroj.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/73850631960.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/14798034090.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/64543341765.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/osor3eqnbrbr3io0lfmunh32p2/saviwefuwodidimupapate.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/o639379c4os4qp40hh04njot2k/punilujodaximaganadaxanuz.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f5840b4af2c89c96827f1274a8b66538/tadanegokufoxorevepimi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee021ea682---gitupezatagasozepa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607051aac015b---29637312442.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/5280739175.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c80060eb---99308798482.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/44757304738.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/47020265071.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/2692811739.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/pnphucu9oekekv9185k8p53673/36727017450.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/230792150.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e1f73aa34d13db46a12022a70dab2f39/96283324751.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/pesotanixivi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e37f2bcf5a338db5411d53fdecc4aea9/fijukunuboranirabo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/35308818197.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0cabe69580672937ff3869ffd9471f5/68771647096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gmail+server+settings+for+outlook+2010PDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 11148 bytes
SHA-256: 659d91e48d8f2472a747a1c6a3347af7d4c307a5ecdfea04869a6d6de6537aae
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 18256 bytes
SHA-256: 6850514f55ad2be5e2109c192d0390577ec42db1c62dc1242c9ec94e61a3aaee

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