Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51a53ed39d26f91…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 23:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89da01bf8670676fb256ca0a5b7721df SHA-1: e65cb226fdd4cd041f26dd266d5665b45ea23055 SHA-256: a51a53ed39d26f913a90910abb1cc64e4f3f9d5c12b36aec5ab0607a2c630ac6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=platinmods+call+of+duty PDF link annotation
    • http://rubella2.integra-sh.com/userfiles/file/zawilasuwexedixe.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/5773588558.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/firini.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04a70f40f---95537119944.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/rigipunenibijobopo.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/61767037853.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/zesinesironabut.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/84038297259.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/boxusateresizixasa.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_5F8FC0282C39ADF3.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/68b2e4e3ef0dd9f3ea4860a88e20a272/33020115825.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/60980996181.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/fawepo.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/57573278884.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134c24818658---vusebabelixaxibam.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/71176943109.pdfIn PDF document text
    • https://petek.biz/resimler/files/fuvenujumimazod.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/26712778265.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/211367faf0f9d47e5b3faf0954a3d30f/vozepofalajotu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/keguxiferotufanalavegon.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/banolikabopusuvevobudorix.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0db148db---gulorosujezeset.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/59422693473.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f60c381e3624306f6ff07e2137f1d9ce/85210119742.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/vuxogizenewelomajoko.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/vokatujijixibujowi.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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 10620 bytes
SHA-256: 28ec3c2d28dfd33f92d5378ba882241bd9ff3594d3a4bdb41a76f8530e324e3c
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 19340 bytes
SHA-256: 3774b06af4cf3ec579f48ac7253a4467e9bebab8ae9ce03244cd9fb9fe80b7fb

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