Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23a02f46bdfa4bd…

MALICIOUS

PDF

82.8 KB Created: 2021-08-18 16:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14715e342bc5fc042ac07c673a5b2499 SHA-1: 7e047354a89245d07b69848d24e4c0bd20d95075 SHA-256: d23a02f46bdfa4bde4fc027bb7cd2ba6ac88b9246b234e9f264735a850979933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pixomot.ru/uplcv?utm_term=vistas+diedricas+ejercicios+resueltos PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f60fb815f---79523477574.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed61a3c2f6---gonojulurixobekepom.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/lalebin.pdfIn PDF document text
    • http://faradbox.pl/files/file/pitapiravokike.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/gevifoxavagabevefarigoj.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ae38e2d0539846dceeefc4470d4fb342/sivutuvikatesagololepa.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/bctphgtfo6ufch2mtvt4jd8l0f/mofojuzuboj.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/29850074676.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/v0e1h6aj1i3jlk9r7ivlrarr51/78504431045.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/15389953366.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160831b0e7e2bb---regogodanesifexagevotoz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a96229f6---fitukomiziluvidisupaluxum.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/tibitexopekujijipagekafed.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/rirawozod.pdfIn PDF document text
    • http://dsagco.com/Upload/file/92170573449.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210717_033316.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/81448527823.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/47465245076.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/sekobakotitakaweguxita.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/vifeparamerubomuzudetif.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b4714c65---zolixesigela.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/53864479289.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 10456 bytes
SHA-256: fbc9b009b932a35638287529d06a236e80ce17c77bb8ee52385faba8125348bf
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17996 bytes
SHA-256: fed5e51e035e9734cd77e1df6b2d4ddea64de7cac8d61dc9f546e668829e17ec
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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