Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a25c4c6a1fffe8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 11:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7fb038737568e18fe34b43f92ee2883a SHA-1: 5089d0acb623cf965253e752c9d0fa7535ee8485 SHA-256: 11a25c4c6a1fffe8b8124d917c3b55523784ce9db1acf7a74901053f253fc3be
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple external URIs, flagged by heuristics as a link farm and a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of malicious content from the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=4d+wallpaper+2020+pro+apk PDF link annotation
    • https://musikkursus.dk/userfiles/file/12879769702.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/52707307091.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/42153428252.pdfIn PDF document text
    • https://tckontrola.hr/files/jewarulexaxuritizura.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/lagupu.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/lojovi.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/34776433293.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/gutiwalilaki.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/xufituxasuxef.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nijikizugorogomizutiziguk.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210910002208.pdfIn PDF document text
    • http://zeci.nl/im/image/zurizevod.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/wuwemapir.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21107717d0c1f8994e74720e7569f9dc/tisazefo.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/pebevakizokeduvivoke.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/gidonumadod.pdfIn PDF document text
    • http://veitali.com/upload/files/7801839337.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/gijimojatomivaloxenenej.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/35234571812.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/depadet.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ddda57370---dogifufugatedeburalode.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/pinoneso.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/liwixasalabetupewelejefi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/926ec6fc727904d0cca9fedbc2135f32/42218496732.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_off0000b8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B9 10324 bytes
SHA-256: 0dda95abcb16ba35464ffe2f0197fca4677756c039f3eaa9a8d1996e6c24ef04
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 18092 bytes
SHA-256: 879509004bf8cd9508350b6c40708ceb30cc7b1975b51c266b5cb10e43df94d4
font_02_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.