Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a6b05e97ecb86f…

MALICIOUS

PDF

75.1 KB Created: 2021-08-07 12:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e43bb03e2ea1bfec8ebb0c0f5080c8c9 SHA-1: 6e6509662e8674d4ce9ea98731eeb7d9a8a873a4 SHA-256: 71a6b05e97ecb86f431a734484a36fdd0213dc10ef82f60b67eeea2f809208c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=kpss+matematik+sorular%C4%B1+ve+%C3%A7%C3%B6z%C3%BCmleri+%C3%B6nlisans PDF link annotation
    • https://bawaniint.com/ckfinder/userfiles/files/98741625462.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5qa3la9pick4rea01f7i6drmvp/gosemawuzomerexoku.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/0ee49aba5caebfee5eb5bb1185b6b49d/67757646168.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4d40acff---zudemerabadoxoruninadoto.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/58454152016.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f61ee5233---41003587126.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/885hbp6q6kbe029hboneljti7t/60492673229.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/63f47c8d59b0ecdb189edbbb112363df/27543351972.pdfIn PDF document text
    • http://89928386.com/uploads//files/202108070401576675.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b837520497edaaa7fab3566188863f14/goxapabosatawutidu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/metivutib.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faab7dbee5---zemuzususegikuzunorovi.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/zogipaliluvivirubusadifa.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af0b001f4a6---vunilufojozapabaw.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/najimo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094793fc8c17---60459756717.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160dff467ec8af---3762088168.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce4cb05e4---74303660323.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/xopedokipero.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab576eb38f48ea477fd534d4c7a8e431/potafaguvawekimotak.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/27764339788.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607758cb90ba2---desaputemoxovezokinerabox.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_off0000be13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 18172 bytes
SHA-256: fb12c3634f810394dcb8937b5ac96f1d8e79f379e81137aacc0b496b0b4e7c02
font_02_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 11372 bytes
SHA-256: 270071a1d37a93e70a63d01e8d01409d3389cd9b11b565a6d7467628637e2550

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