Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45311e3e7eac7e7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 16:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d84f1bfd751497ec16f880ec8a2ecc2a SHA-1: e74b2bf770ecbe4d3608814ff8c652d5a4993e4e SHA-256: a45311e3e7eac7e7971576f1feddcc70b3e95052f209b5892fec27ba777d7ff8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://egyiksem.hu/uploads/file/25741775848.pdf In PDF document text
    • https://duocvinhkim.com/userfiles/file/32789436882.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ace1f79cf405b90729fb79798dd923c/xoxezesexadegosafez.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tifevi.pdfIn PDF document text
    • http://poorclarescork.ie/images/53277112591.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4043912553---15466508840.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/fekotibaga.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nlg4a5rectp0gu7m470fo2kpp2/fowedarovepotadujakejore.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ba98bf661c48d3d9d292e1109e0cbd3f/mojusopimit.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/34610662538.pdfIn PDF document text
    • http://sccsfz.org/upload/pomupisolalunixizix.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f661214b5---72505601012.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e37bd10f---zimisivedagof.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/55874249900.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/mojabanitulu.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/46731158506.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/kigadunodaxoloforikom.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca77ce5a9---81921507687.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/80384059344.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/takanonifuzak.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/780bc2cb63f9a4c4fa5d3b5b0ba6c304/sipekefoj.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/nokazefugoba.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6aca9d212---48721184584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=easton+arrow+selection+chart+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_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 17544 bytes
SHA-256: 4571f33d0b09c22d47787660af81040051a7692ed6f59dad3d8c5132bca64457
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 10788 bytes
SHA-256: b447169b6817157a5f8006d67961cf8917a7e8ccb877d4c9633733ca337839dc
font_02_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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