Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddac680faf9b97c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 08:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 032a92e9a6a9355725c7d08bfcf16d1a SHA-1: a33cda401fc8e2391ed43814633a1f65ff230cb8 SHA-256: cddac680faf9b97c342b4a457996bc1a3ddba6800f610aa5f4f8686eef467530
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dc45a954a42d2faa678d680da1c18d1d/wogugomerubem.pdf In PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/67171819680.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qn1cgjv8oknsjtv31vsj2b3cqr/38667922733.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ebcts4j3eburfl3gpvrtfk6t1f/80584939759.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/fakerukufiw.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160dde9cda09f0---94674207779.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c79c2d0d---37879261057.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7a499f2d3ffdaed76aa624c883601cd4/90477580359.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/75303882912.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/pubuvigizemeriruluj.pdfIn PDF document text
    • http://abworder.com/uploads/files/mituzurewaz.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116fb0e40634---8802274445.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/jewudutazesure.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/3cff7e146cbf80cca752e7d519b28256/46295160244.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092327185791---laminavotoguguwom.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/15634013013.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/36977745131.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae7bc032e---71242800844.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/98967468207.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/bagazininixorosedojod.pdfIn PDF document text
    • http://mobitransjogja.com/files/25157510356.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/29780487704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=riddles+with+answers+dirtyPDF 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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10468 bytes
SHA-256: b0ab638be80d9f04a1831a0fa3e1b9fa256fe591743b9d0ee96cd4ef3656b214
font_02_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 17644 bytes
SHA-256: 5614cf9025f4f37205facfc5a8b2f33baef5e9c7126dd7778142d27efafae79c

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