Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5849bee5147bf21…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 07:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 851ffb00af0e80ac22c9a79a13ef85e4 SHA-1: b974665a9e14ec8e7afac11f431ac31cc37c6e3c SHA-256: a5849bee5147bf21a7ea91b7eb225e29d3071225b75714bdcfbe7b4799e98c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=how+to+remove+google+account+from+android+device PDF link annotation
    • https://glycocalyx.nl/userfiles/image/file/rupurememevanojivevupobow.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/zobubalebegamad.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/vawikirabufed.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/n9imcfg21gqkam438iuon0hct3/8229645983.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fa96834e8---vutubetur.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5d2jdqeig677i72ohmraa7os44/84716447295.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/88765647161.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/37998737987.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/90573540943.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/vokev.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/696ed97b014f926ac80886278cd19a4c/76476203699.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/53859736278.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/48531815323.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/44705515475.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/12274257648.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/19369453106.pdfIn PDF document text
    • http://demkapi.com/resimler/files/34077001133.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/saxizenaxopegimugadegu.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/gepowanepokanufetiv.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/87355577879.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904023050919586.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/13c2550a2776ff1e000f3b017d7af048/lodofimaki.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vinitopudifumazavida.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_off0000b636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 16952 bytes
SHA-256: 4e1b89370f3edee388ac404f57d031ab7271dca4bc3aae957da84c4ae823612d
font_02_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 10892 bytes
SHA-256: 6c0da924067732c2a37a4f3cdf29005bb26cf010984e71b11dae68c942218306

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