Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9387cfbc581a89…

MALICIOUS

PDF

87.5 KB Created: 2021-09-16 09:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d10edb62ec8d2a94149032d12e5d81b4 SHA-1: 019ec2568cc1bb8cc12d603df7ba29f3ca303e56 SHA-256: 2b9387cfbc581a8975d3a43a708f290aa5b2b2a3488736ac042124774a252e7d
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to a compromised WordPress upload, suggests it is part of a phishing or malware distribution campaign. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into downloading a payload, likely by exploiting a vulnerability or directing them to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://oniceh.ru/uplcv?utm_term=roblox+pro+apk PDF link annotation
    • http://serenetour.com/image/upload/File/66828623726.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/34270790847.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/gasazikegabafofobawa.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/bagapubazakejibidoj.pdfIn PDF document text
    • http://shesob.com/file/files/51062720261.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fc7472161ffac43c65a188714f0e5b17/70934348449.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/pobeli.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/10748778265.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/3606937130.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iq3hvbfitsbekf6e3smurq87o1/kowagovezepozelimivup.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/neliropobixovo.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/15151591845.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wavafuvebaxotaw.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/75208825335.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/52546686867.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/05327ee5de6729862a45b3bea3aff442/mikemuwixamuxiwobigo.pdfIn PDF document text
    • https://claudiodituri.it/uploads/pigaxujin.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/jenidukakesire.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/10660611296.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343a8d685b7---rofezazepasa.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/13401057684.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/131931128530.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/61258333637.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/31109307865.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/47051077895.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/93273575273.pdfIn PDF document text
    • https://fultoys.com/userfiles/81612192560.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_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 18348 bytes
SHA-256: 5bba0a03e416c7ce081ed0c51386f4f5e4ee43daedf9494d984184bbd9661b70
font_01_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E8 10028 bytes
SHA-256: 99c197b1dcd207995893873c3d5734cfa44722ba0210e006aa86d9c29305d93d

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