Malicious PDF — malware analysis report

Static analysis result for SHA-256 64845c41127b8300…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 00:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 279a2c35334977c361adaaf63b6fd7f5 SHA-1: b20fe3500623692c8ff48f734e5289a7aa8d904b SHA-256: 64845c41127b8300381f8dc95db353965be77c5c41ed6c7bf7ea3fbd58130614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to obscure the final malicious destination. The PDF structure and embedded content suggest it is designed to lure users to these sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c29f35120cc3d30ab45004cdfad4eae6/82546710892.pdf In PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/xanigodosajipowifogabuzil.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ml31n6ne57nlsk5n7g6in57jns/pitarek.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/mupoluvofat.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0d4nd65ig73o5ek8jt36pq8hag/4389865583.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/9459819496.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161299556255c2---jipelajutuzis.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lunomipegipovomujizufikiw.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/noxazaguvupebitis.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/91532297325.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc4c0b041---xutikamenuwivutipebifojek.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/rabezoxutizixojinosupom.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/44mvk9soq4gbfufnlae19t0uvl/24875112395.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210807000722.pdfIn PDF document text
    • https://schmitz.cz/res/file/zururonajisikoxagog.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/82247057829.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104e6d392399---kapedotodo.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/52937409092.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/31018963855.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/65793579130.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/modonekafa.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/texuwozaxajipila.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/robakixibik.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbb328954---40540365478.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/doxepufezividatu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/uhop3hsvd3hq67n0uvmv1q8lbf/dukunejizifivev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ohm%27s+law+tutorial+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/vamibigasuga.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 10772 bytes
SHA-256: 202ed5d8a93da8eaac21254e45e4d7f284a40ee339bb305a3206c9f418805dec
font_01_sfnt_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 15432 bytes
SHA-256: b9c01fed844013b49ab35934e111f2220608eeb49d11d81f896c48c1c1262be4
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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