Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a3602ff3b9d953…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 23:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a877652c2a1267bb5120dc510f2b6b93 SHA-1: 6f506df2d9b3e546e44b237e1421e8066adf8922 SHA-256: e4a3602ff3b9d953acfd192a75aee5565feeca3b69b140b9db8f39d2e7716bb1
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 social engineering lure to install browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://telecycling.info/files/file/59699329386.pdf In PDF document text
    • http://twinmd.ru/userfiles/file/47243354905.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/86696710770.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/mufogixenitunijaxene.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/48612468077.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/4383603676.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vesobuw.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xisupisipoxofedosejuderi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52ebb7f9f---88786034195.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/25483577282.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/50116763840.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/golaja.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xazabiwebulefe.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pubepagatikazij.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a047ad2218---96859989352.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f5fb3fc8f16c23061cd48c120a7c4bbf/75925982851.pdfIn PDF document text
    • http://montesantangelo.it/files/files/bajukevokok.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/53158812784.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c37f1b8d6651867ce58efc950fb317eb/49179213912.pdfIn PDF document text
    • http://anpharma.net/upload/files/17328860228.pdfIn PDF document text
    • http://jsdarvin.com/files/jedukef.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/93122928175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+inspect+on+android+chromePDF 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_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10808 bytes
SHA-256: b1d9cc3a5f8da593e4f0bcacb0c88883c6d22a8c85d7d08b1110af1fe0861061
font_02_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 17960 bytes
SHA-256: 4b008a7c0780101d9c28300cd2dc2b9a5166b41e71169273863b026987138ebe

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