Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7286ff8a438c350…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 21:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0eb7e1f137eded2e88bf8ba231ab78e SHA-1: 848a8457a51fba741b1cceede39a00f3b0a8583a SHA-256: b7286ff8a438c350876043f19d50f002c41d7b5e07954d6b646390d24cbe22f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=occupational+therapy+definition+pdf PDF link annotation
    • https://textosolutionslinguistiques.ca/upload/editor/file/55235249797.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/niterak.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/lojovadalelibobisorelupon.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/72843516188.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/23698603509.pdfIn PDF document text
    • http://msiutilities.biz/documents/gikusex.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/segexipiximivezenadukel.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/75861aaf714da55a345e8058d1dae443/9166303753.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/90861524625.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/de82c2ffc6a7e6d4f32fd930085b7e1d/puwunisavonomipoguv.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vde92o1fs4l5oca3v3oejdbrj8/kaguzazekiropagadixabewiw.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/guzoserafemajaxobise.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/35893607609.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/38376489865.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe3b6a141---21637510308.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/08/31/kusutufitux.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/sizubebumebedavopuwosul.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadfe61073a---81603918120.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/41771157152.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/fdcdb36cd6bc7a982652039adf4c3f46/53052786593.pdfIn PDF document text
    • https://nasikampung.info/contents/files/22845155526.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a05f568537---41625893448.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/60012320463.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073a567e0965---rilolunaleluzunokomegapo.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/fatobarugizaviniwi.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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 17120 bytes
SHA-256: 158999bf60a07b815eab1f0bdff1e2f568279e38e0fe8045a0faad324cc6b21e
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 10788 bytes
SHA-256: 345647dd39af94b0d892a66c5245f0d8769be5e37cdc1bece8ba8ac6ec616d73

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