Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17090315a09841f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-29 14:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5b44af245c77e61ff8ad2451f3337fd SHA-1: 5abd5ab8ca6b125206f4d69dd28bccca2db68b62 SHA-256: f17090315a09841f22827e759be590d173e519e693eb2b9359f769eb8efd10fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=cara+mendapatkan+pulsa+gratis+di+android PDF link annotation
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/boxejopa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0ca11e275---82949732941.pdfIn PDF document text
    • http://lecostationery.com/files/file/bukupavatapuboko.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210902010848.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/c3ed812012d069c0e3a6c71fae877afe/tuturofodegagewavuzanezuk.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/kanulizo.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/97012168042.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/280332445123.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0ced6385---36355515538.pdfIn PDF document text
    • https://seikai.jp/free_images/files/genoxufonupopazaxe.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xuguzejigiwolujapa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e468d0282---32544682394.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/mikamemexatajiwejebon.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/63006860000.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/birazexi.pdfIn PDF document text
    • http://risme.vn/files/29438059030.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/26352056cee5cd4732ac6c1f8baf0d0a.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b1911c73cb3ea1526aa604ef06f87183/11556230518.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/20736160975.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/xelawajuzofe.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/43826042300.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/3144048397.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/lalazafubogo.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/28594474526.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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 17352 bytes
SHA-256: ca954ef7e0ce8d77afa142dabc67965e61dfd75430a97ed3a62e493b91eea433
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 10960 bytes
SHA-256: dc0f74e65e363a10601819e2b38eafb96061f9c6696a0dab214e5abcc9a103fe
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1