Malicious PDF — malware analysis report

Static analysis result for SHA-256 745a4a6e95c90df0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 11:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5550e019e449a71064cc4d7affb9a4c SHA-1: e5ce0a512b5f2095e7c953c055e1dda42a3e0170 SHA-256: 745a4a6e95c90df0d3430ac28e27126de9afae1979e1d2e656adaeb1a40be3de
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point towards a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=chrysler+town+and+country+2016+manual+pdf PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161271c09bb9b9---97269414887.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/potipizozofowel.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/32572568424.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nobovopirumedafokujopo.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/modepulugejotepegefetir.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/37770368666.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c400228009a67f99e5a03301486b75b0/10051196135.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/73945003265.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/83243598210.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/92474392757.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/8509782290.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/30178476734.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pepulawos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f72699bef---1203090487.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/46473830155.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02e92fe3a---mositaxivilesiwab.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/bexudugafadefajozisemodaf.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/282346238033.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/93fh6sibq3h1df26aj0bogq37n/65734732012.pdfIn PDF document text
    • http://mav-auto.ru/images/file/memumut.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sukusotasagofojeruwu.pdfIn PDF document text
    • https://wrd13.com/force/file/jizugowutemitak.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135adcc0bc04---39073624704.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/022017426444.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/23370320542.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd80072d0---ruwelobisefamaw.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_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 17048 bytes
SHA-256: a44caf38f714eb0c3fe7baa62364ce0b7269cb05d7432b6389df167a90cdf805
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 11588 bytes
SHA-256: 48f3f6f4c29917d267591bbe924e54c224e7267f13915c8b70587cae38346432
font_02_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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