Malicious PDF — malware analysis report

Static analysis result for SHA-256 1def564f3ed4bd70…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 19:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f299e18710460e5817b74b06a4e8b7db SHA-1: 5d9a01ef05df15c3189bd0b1d60bdc6854288de6 SHA-256: 1def564f3ed4bd708acd0396e9c29460e3d7b447b116e66f6932ccc8be616b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL analysis point to a common tactic of using compromised sites to host malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cjatkinson.com/userimages/70689795256.pdf In PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3ffea09530f2104f913b8788156f8aad/woxeg.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a771adab0d---jazalorufawaxu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/54286761288.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lemibojejafevekivubewa.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/zipufilenisozunebizu.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/tataru.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083326f43124---mizezatijadatukose.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa09235ddf---gusotegepudomefotadog.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/55782984324.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0497d3f0---visiwiretabozeseni.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3205904aa00e99139994a681a752b0d6/18996753519.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5b2a42cff353a50a37022688d3af6e86/nefopiwibariluwi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/41926526784.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e448d16a---75060564829.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65995e089---30595236291.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/u52u5f82goa7e0d2uosqiv1kh0/205528705.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5r1cs1gh9b0gt6q7l7hl0ap494/66030271155.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430061019663853.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5c28c473574327f103a8923ab8b83691/mawukofem.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac80a7bbb---xijememuxufope.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vvmjrpn9l4uvqam76otc0codv2/34329755093.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/vudigobusevojite.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161176e919ae5c---gemujibavurane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=philippe+sollers+pdfPDF link annotation
    • 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_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 10232 bytes
SHA-256: 3db262c66e9bf48913ea9a0833ee6e215a5df4a97fa3b00794cf0add7ae1dad8
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 20200 bytes
SHA-256: a368ef124b102578f104bc010292ae7d34f71d541bd4983ec872c140933635ab

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