Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0950f915330f1a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 19:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d0f26ccaf8dbd3d8a10b41491cb8e97 SHA-1: 8e4bf70499a21af14a0ac3b35ecb7d22706e05fa SHA-256: 0b0950f915330f1adae064c4bb42a4f40a8545e620935376287a2c5fd0348482
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. Several heuristics point to the document being a link farm, with many URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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://primehorseproperty.com/userfiles/files/dofodojowaxalilumasowo.pdf In PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kixadulimulivanowif.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/barebolagoxozenur.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/64674558372.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zowibowosesugubapix.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16105e4d47825f---vukibukizuzuwurejoxinaro.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/boxarem.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/doxipibowebejarudokatiji.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/3900574678.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cca723e02c---gogebifise.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/u79bsc080548fjogi4oa22kjmi/badupixelobebezumo.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/vasezatupesunuwed.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/54287075655.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/gakigirivufiramum.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/babijosapusulagotobe.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/52598257900.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/sebutaji.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/wogukajimumopeve.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nd1186ibalofg2qe24pqdfdvp5/bitejotonosisegutesemoji.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/7540506903.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8dbc035a---lumewalipulus.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31817af7a---42804004171.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28358ae4a---nesoxiwarifefadosudutog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=principles+of+roman+architecture+mark+wilson+jones+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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 11296 bytes
SHA-256: 400d7a82500ce6ec2fcd0ff371932ae2bd23e13ca290471985e0405fca24593f
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 18136 bytes
SHA-256: 0eac234c3fc08cbedf64e82e59b7f8f4405aa6f4d7c26442e5319d878c51ed6a
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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