Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a37197efff78804…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 19:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0366fd0d10605131d657eea4261623cf SHA-1: 66519859c01a0186f835080ff660b56c1ee38863 SHA-256: 2a37197efff78804052033732c469c5f7ee822aeeffdf33fe3c8a7530cd15686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=dishonored+death+of+an+outsider PDF link annotation
    • https://mokhalasati.com/userfiles/files/pisetimazupiv.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4b119522---73897230446.pdfIn PDF document text
    • http://debden.org/userfiles/file/nurojewekudilu.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/pefajevifubebuxegiwixovi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/59867384697.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/29161106391.pdfIn PDF document text
    • https://actor-conseil.com/files/file/najejexugegojetutasi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nilativumopudujidudagul.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/nudevo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/30187960714.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/38856015775.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d5a01167a---63376978228.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/90a2a29dff3f6b4a81c176b1febefd2f/35501298964.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/j7p23o1ldqlme3jllccfe0m8ej/10386190848.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bf2a25f29---mutunijuzusanuzuweje.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a868e141e67---57427864647.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/20c1016625168094a17ee083e08d168c/bafedetajibu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/2301109347.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71569a4507---vonapuzivepivufexadex.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/fobineb.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/098e05648d792542e289c1c81509e193/76658522879.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d0763e76---rixevep.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/89068576871.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4863dc9f1---buvisedaz.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nivufofokasulowagaxufaloj.pdfIn PDF document text
    • https://realschoolspirit.com/scauserfiles/files/tojefoge.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_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 16896 bytes
SHA-256: 363c6d53c44f1601bfcdec6df879d19a0135b1a8fc46fabd97e07e5da3f62ec8
font_01_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 10504 bytes
SHA-256: af54c67a16f12bf094a168912441f1599dec1ff5110c67e9d8b2e4404668341d
font_02_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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