Malicious PDF — malware analysis report

Static analysis result for SHA-256 4897f30e000c6fdc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 12:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da16906d4d5cb8d6d60a5c65d7b0ff85 SHA-1: 9094548f3094bee14ce97d712557eb24b53de743 SHA-256: 4897f30e000c6fdc84fdc81262abd2d6fee85a6d3497276274c65035e754ea17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=how+to+transfer+storage+into+sd+card PDF link annotation
    • https://limsurdua.com/contents/files/15173065090.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/75498743362.pdfIn PDF document text
    • http://eternaseguros.net/files/files/tisitabowedevaranusuboxad.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1df729d28---54464293190.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795cc2215---78771743088.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kuzobebumomakifuweberu.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210906230238.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd57b5a1ea---xeterabewak.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e3cdfd9d9e9defcfc3f266bef4da5ee0/junamenoxujomadogusutesa.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091413575756.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/29645330009.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/5467976046.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161419a5538f73---32866282047.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/54164046239.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/rujowolafuvodajeluwasu.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/kuguj.pdfIn PDF document text
    • https://tckontrola.hr/files/92794152474.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/28936410313.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/goputobonobug.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dedumi.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/724921318.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vatevasotanamalevolijem.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/bolufiposed.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b5700af3---12623602727.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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 10684 bytes
SHA-256: 153b21cbfc73935d7be41022e355611bdb30ffa8000265a87e22d648831784d8
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 17708 bytes
SHA-256: bc8f78ad1e489862bf07f4def01e445d42cabfd703af374ce2ab4daa5bea732f
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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