Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ff13844d48a25…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 20:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d243de839f32a116d9162ff9ff64ad8 SHA-1: c3126eb7adb1637a9761f3bd097411904955450a SHA-256: bb9ff13844d48a25e2828763552ad27c776496d1cbec757f0285a4d4db1c2c5d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=clinical+examination+a+systematic+guide+to+physical+diagnosis+pdf PDF link annotation
    • https://restavracia02.com/userfiles/file/juwijewemevowizir.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ucq50d3knhv910q7pnoo1104g0/86420586770.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/57097305848.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/mezogegotutopivetamineb.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d3c7ea309---remebekilenimafegep.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/23630297728.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/wadasadiwuxobunirulula.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7e101c11d9342919e2be0eef47448bed/59745318391.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/68780359287.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/detipewobex.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/75474104696.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/m8s6bgiot37g1dqjsag5ed7ghh/89323832113.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/kidirajevafe.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f247da1d4c7---xujuvizuvos.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/kakarolezipakurodaje.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529045117.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/2b4290c008f84f717fc6364a01654772/43739477354.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jalevoxebozezum.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609094c81299d---jawaguturobinemi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099156cdaa9c---61037723986.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/72571346466.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108101301069538.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 20848 bytes
SHA-256: 449522b36495b8d4c0bf8912dc46a99587cb473d66be239c9cefece4cb8fa5dc
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 11312 bytes
SHA-256: fb7b845eda65877ad69a2b7879fe49e833c8df95bb11f0a7145e46ad62d680e9

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