Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b3f34b59f88f20…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 10:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8a7e608195415efab4efcab3f2d7809 SHA-1: 16c5e47a4a74d26b7d87230b2a6a4818caffd5e7 SHA-256: f2b3f34b59f88f20123239b9d7c07cef60ee83bbb27fc98dc72a6c55549d3127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

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://okudshava.ru/userfiles/file/1847339414.pdf In PDF document text
    • https://mehreganimaging.ir/images/upload/files/gonuxogiwepero.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0f3b8d2218402496317e97da90de8bf4/josixiro.pdfIn PDF document text
    • https://rosycaffe.com/file/losasikinefutu.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/41898499457.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/zapowupugazedesosuder.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/19302177047.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/12700853703.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607849a18a655---mojepidapem.pdfIn PDF document text
    • http://rnralpha.cz/res/file/2865513669.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/fazedakuwavotobegoniren.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/89141482073.pdfIn PDF document text
    • https://bnovum.hu/downloads/73928247861.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/videfaguzoxetufizoxob.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/37658302166.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mpdj3rdc6l1ka5blii6u0r2of5/43095330764.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rebigo.pdfIn PDF document text
    • https://projetovm.com/uploads/files/76623349804.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/45878103786.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/53207195950.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/pusavepapozixolitube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bertolt+brecht+biography+pdfPDF 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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 10936 bytes
SHA-256: 968564b156d15d9b0c0407bd5e8c322e42853e9a51ddd64a0700773491a6652e
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 17088 bytes
SHA-256: 408fb87325e24dc049418e68f17f37263f8861ed2ba591c4d2db5b6e28b01683