Malicious PDF — malware analysis report

Static analysis result for SHA-256 f256d848926496a9…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 01:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b52d57522054799c7f4ef3ea449e7f72 SHA-1: 4fcd07db92dc771f65d3a03a70029df36b01f67f SHA-256: f256d848926496a90b1a08cb23b5e2dd2f5f0bcd24d36790c1f941c09b45113c
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and a lure to install browser extensions or updates, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://etoprosto.ru/ckfinder/userfiles/files/fifesugiradevof.pdf In PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/8919110430.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/97339513167.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/48168935825.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/60331110950.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7h025sanpui4sgp2nj200r2bg2/33936409711.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/lijuvarumufejulur.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb4f3cf15---48142771877.pdfIn PDF document text
    • https://digireg.com/upload/zinabefij.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/47097799944.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161357423da2ef---70819486449.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/rotezapivujuketosubige.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80b253529---20851519600.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/17588849111.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/71346605810.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/56901106387.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/76923199728.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/zivatelizozufezaxuj.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/woxobodopakomigapeg.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/89152634341.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/15116293714.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/xigalopizezagemoz.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/gekoxifimotekidivudeb.pdfIn PDF document text
    • http://goref.ru/files/file/82608543933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sprint+apn+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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 17720 bytes
SHA-256: 4ac0b47e5c840558cae8342daa7c21db71655e6bfad99cb826acf2056a6ecf3d
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 10112 bytes
SHA-256: 84dbf6754eb91b6a1fe66bc85cd284e644032dc74f732c22ba2fde765c542b4a
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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