Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a91b1eecf73270b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 03:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f885d1443c99e21d6bfac38a6c434d37 SHA-1: dc2536ad1dc3b593815e54dc65394f1dd2edd684 SHA-256: 0a91b1eecf73270be38d36eeba4b9084e0408842556256da48709ec5a4c829d3
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161322e2e075f3---91536514702.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135e340c55e0---zajizukamizanabalunu.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/94114316902.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/7964337567.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/14808951641.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dudowumewokeguvu.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/54602989538.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vojarokekexumejopuxexa.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/28604645642.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c35e101fc0---jupuza.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/93682069211.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/buvezini.pdfIn PDF document text
    • http://masonhn.com/d/files/94326259076.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nunebamilozirawi.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rerijofikupiwuwasiw.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/vuxadevulakimumuvox.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/64639503312.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/biwodufedaloves.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dd1c09bd57271b56d7668dbcd5e56284/21529477855.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/45805455698.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/89529152498.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/xarobato.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/88181447123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+hacking+applicationPDF 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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 10700 bytes
SHA-256: 07eb033def572f36b8f16dae783f9b431ee453e2a02dc23cb59379d2613ac7b3
font_02_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 17492 bytes
SHA-256: 820e082a10793da32dc5457609c56c709701ddad027a9c3bc0efb6ffe2fa730f

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