Malicious PDF — malware analysis report

Static analysis result for SHA-256 927156ff7b0f1323…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 02:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: baf38b3a0f18e77ff43f121ebd9a4cd4 SHA-1: 661016f4c1f9a066991c346231c5f17b757c402e SHA-256: 927156ff7b0f1323b9fb7ddbe85cc562916b2e0859f4c7bcc4d3c9d95990743e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised websites or are structured as link farms, suggesting an intent to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gezuxatetosama.pdf In PDF document text
    • https://bczenekar.hu/files/file/gifogisur.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/taregofa.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/wekefuditizosisoxozo.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/finisojarafoxawakuzi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/vac6u2695oafl6t6253quhaag0/nedobomefirilifafes.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nefoze.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/padegoxijagusoguxetu.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/ligalureza.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/bumedadowibukekuda.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/televujexeg.pdfIn PDF document text
    • http://asqcert.net/files/files/39223105815.pdfIn PDF document text
    • http://canadanur.com/resimler/files/65240499380.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef9350358---27848614510.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/fodamigejofu.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/9277548872.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sugedunekenuv.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94ef6d9d827b66c3fc69d4fa240e88b9/78593094385.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/35876493545.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab5dd9212---91427304898.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/37333064494.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/26875911985.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/guwure.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a23bd9da93---zuvakesepegojara.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/1690634446.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/jotixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dragon+city+mod+apk+private+serverPDF 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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 11084 bytes
SHA-256: f0bc05a7408c10964fbf2163f1e78261431eea40c0b2ffeed870bdd9984b8fea
font_01_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 17512 bytes
SHA-256: 8cc1ebd04160c4cff47852543d612cbf15fa68c3dd85eab2ad8688a9835ee14f

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