Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f760f5a438b38a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 05:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52167badff83d5f2e6e8969b7a60b279 SHA-1: 4769488798cb8c2c41e02cce43f8b2337a608d11 SHA-256: 60f760f5a438b38ab11909ee41c79a071de0f0de107c003214a23d3429a9002b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier strongly indicates maliciousness. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as lures to malicious content.

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 https://allytemp.ru/uplcv?utm_term=aula+espanol+pdf PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gt8s648thiu3evbfmbtnhm16mo/58260548876.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5838d107ce13bbb4398b48b00e239053/gezetanosuvi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8da643a3fbd1682e98c3434ca38adfba/60137853477.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gobnitsh0piaak0bpp2ssrbk6e/javezoguxujumonodesidelu.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/7977853588.pdfIn PDF document text
    • https://argumentua.com/i/file/41941393642.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/99110539346.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/862b5e53989bc40b711c806f2c667521/muwefufodadexipomixuwa.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/buxusoduvagolelujinu.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/nojeposijiwuxuxusirexopis.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c245c690486---giseji.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/39455226653.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f0ecc7caf4880e18389c11947a867c04/55167560091.pdfIn PDF document text
    • https://bselink.com/userfiles/file/33525747260.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/xuliki.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38067c9647---2201258825.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fab67d91b00---kuviboxit.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/90444180283.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/69147266336.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/fofuwalekevafokataloj.pdfIn PDF document text
    • http://fteq.ru/files/file/xadinefakobanux.pdfIn PDF document text
    • http://africareview.in/userfiles/file/fibuzegubelawamopakuvoka.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/sosizimaxikebagotisulex.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7ktbni2h2ua6im99rqtg25rp48/65467375029.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/lasuvojewuraxubenira.pdfIn PDF document text
    • 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10280 bytes
SHA-256: 9dcf9a0d7d5b9370ef5da18ec75cffb1539956b45df5bbfcbd310ae5703f77cf
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 19132 bytes
SHA-256: 0bfe0ee4a874569d4bb80814c86c433a1ea7d08dd035c596a8d152062e038317

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