Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6987b32b9676168…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 13:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1485a3021c3c61a7c981a02316716383 SHA-1: 1ee89abcbb32ab44d8bfadcd4ecb47e6e0ccd454 SHA-256: f6987b32b9676168324d4b1640c0371b17efa2fa7aafcbb63f5de9dc6b3e2fb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to a malicious download or phishing site, masquerading as a software download. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=download+capcut+video+editor PDF link annotation
    • https://yunglin.com/uploadpic/files/40263345475.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/88609496553.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9ad0q4u0dfta7uv953juskle9g/ravogoxobitane.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/riwixutovogasu.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/lamiroforawu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c407db93d2---simajoloropexeser.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/51527747011.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/522122237.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/13011980306138d6b15e2dc.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ibftdbpimcde0lgvsjgpc4c660/zevatemozujilomesiwami.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/55210327590.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/27158918385.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/pofojurafoxediku.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/82197272510.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/40647824850.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/2160284782.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/golefuzujopuvimezazas.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/jizov.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pawuvivagogewafewove.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/rigipunenibijobopo.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/porekilufasukabuxorugex.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wirotovetapololuxenebibud.pdfIn PDF document text
    • http://cartopack.com/Images/file/68432925697.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/9592467906.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/guxowarotakaxelilanav.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/luxarudifigunegizuk.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dc3a4cfa6---23945626914.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_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 18528 bytes
SHA-256: 3459d695fe88be008b4eca0870afbaf0343666ac277ccc3eec9def2fca94f0ea
font_01_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 10592 bytes
SHA-256: 850b5e3c9f59f695afe8a6a15306a5c9563d148f21193258b312271427315497

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