Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dde624864bc37a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-29 21:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d4417f793e10831825f203c041215531 SHA-1: 90d0ff960c9f3a47fc6ac5f5aaa28daf88211a2d SHA-256: 23dde624864bc37a12d0adb780eda6340d5dd299dbaa8e7c72cee0ee5bca6ea1
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains multiple heuristics indicating it is a link farm hosted on compromised or disposable domains. The 'Remote-support tool lure' heuristic strongly suggests the document's purpose is to trick the user into installing remote access software. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://lactopad.com/uploads/files/58752753629.pdf In PDF document text
    • https://dollarplus98.com/images/upload/files/4190729961.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/857bf5fac8e21f5d09c6b6b1f05dabf4/5959874915.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/70958412733.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/867d1be95c61539fa48f5dd40f73f754/gival.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6453d37b4---bagugefokomifevomuvele.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/nolujupoxugesiligizuvo.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/fuxogegasola.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0d75afaf2c240a6d453f5c0290604e18/25243139113.pdfIn PDF document text
    • https://taperagi.com/contents//files/walexubikuvupatezo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7efba47f9ee7eb7a5d335b2197ec3991/rawevawixexamajeti.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/l3tucno3vsjbi7aht2n1rg3pmk/35476033957.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/mufupe.pdfIn PDF document text
    • http://derma-dts.de/files/file/goderopesopeperel.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084980002e3c---jedejizodotijajuxowiwiwo.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/bamusezepul.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b121050d7bb---nemoguwowikuw.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0edbb759ce6fc3c47153055fa8f8c3e9/62020313611.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/s0hitgru2oejohde93bma5cfig/sabimejelagemiku.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/19209313756.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/76990686193.pdfIn PDF document text
    • http://poiskvod.ru/images/file/ropevuje.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/82196200605.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hg3u1cn45f9u848je901nfqetr/21580456770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+iosgods+on+androidPDF 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_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 10368 bytes
SHA-256: 610a94643e07449cc2743f8dbdf42a5e6f8197be4131d126ea4861d06297c13a
font_01_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 17340 bytes
SHA-256: a3fe94f40691ccc95287a1524e66de30083e08cf88c7f59c50be67ea459cb457
font_02_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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