Malicious PDF — malware analysis report

Static analysis result for SHA-256 12023c625fa2b919…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 01:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82986139751b56d1aa88cdb1de94d1e1 SHA-1: c0122b3a91303531b618cae423103c1051b80043 SHA-256: 12023c625fa2b9198952a6e0dd12fa7ac1375cce2b99eaa4088a19c083b9b333
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=providence+psychiatry+east PDF link annotation
    • https://photojet.bg/userfiles/file/sobebut.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e08009bbb---35178258181.pdfIn PDF document text
    • http://homeopathyhk.com/files/94723217636.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f2348a42---wavub.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/nikotabogorilaneruxural.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d230a95c---14411304913.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/jewinivelig.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/97338613743.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/jabepawimeduvarijixe.pdfIn PDF document text
    • http://mesterek.net/tmp/mududedinoxi.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/podufono.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/51338366409.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ce9a8693---89931843229.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942d92ea18b---32189936371.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/61895dfe999f5504e66b4f0203ebcf95/87790354463.pdfIn PDF document text
    • https://caffedisanto.it/file/jodivala.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/64495988280.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ugufktapfopvo2lsqa1duq3ai4/xunik.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/53579089956.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e47r7v51b8s84khnd7au7bv98g/93720682861.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771b0f25bcc---14552371613.pdfIn PDF document text
    • http://gptools.net/userfiles/file/wobabipufitikojomedafanof.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b308b5ebf79---terelizamubu.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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 10744 bytes
SHA-256: b03dc16a187370b4b1712fab787ec6f0a3e70a1f02f40f6a95848561fc71434e
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 17544 bytes
SHA-256: e6e40ba89c8b057aa1a5b8b7b64fc27a91f9e7ae007e284efdc316c06696b6ba
font_02_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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