Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3f4e85daf7f885…

MALICIOUS

PDF

80.5 KB Created: 2021-06-16 20:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 21f43284e8b1e7edea8330302f83a31b SHA-1: fba40920852d16cfe84b6b9dcac0c78ef18e3886 SHA-256: 7c3f4e85daf7f8852bb0204c4c2fae7b8ec53254ce91efa95a9873851129998f
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

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://cructi.ru/uplcv?utm_term=river+flows+in+you+harp PDF link annotation
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9j47qpfrava11e4runc15v1k6b/25499176626.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160858a18e60d7---werebilo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e1d4ab6c---11622158980.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/69615002995.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb079de98d2---202474832.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/levirapuzip.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5702f2830c---24165000975.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vumexava.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/39339281987.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4a29645d---ludukibitix.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/lokawipuwafipi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c81568800653aa30ded7f72e33ecbd3b/80197048368.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/61c0eb403bb6374415f283f9d9a15aef/wisiwujuloxigitube.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/25737328244.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/xetamenoje.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805e895908c---4486967567.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e14a1f3f1---85945536079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 6724 bytes
SHA-256: 41d3f1c04fdb619148900fde2762b52300b191da2256c4f7f34b001b776cc0d1
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 5252 bytes
SHA-256: a9cc87dd5c7c8afeddbfb0ec42a77d6bd4f9747fd9bcdb17eb9f4473f01b8435
font_02_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 11852 bytes
SHA-256: 9bda9c78f87ffe74726d4fb0b6ce329a58797a1b6655a8b19e8d02354cecc69e

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