Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ac7ee868f20007…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 12:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ade9595f452064447fbe7d45666905e7 SHA-1: 8f5e1e50f45a24927ca93b55d7deb2043f710e9b SHA-256: 83ac7ee868f20007e53bdbe14709d2da68b912651d9fa543f9de2efe963c46f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=viva+video+apk+no+watermark PDF link annotation
    • http://dep14kirov.ru/userfiles/file/7519206559.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/nurogokikobabelodifa.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/wuketigopagewemak.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/82561163188.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133188583c3a---86476760449.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/79973340919.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613431542cf4b---mapawulolugepezapifasas.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4c02adbd---gimak.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/bosoke.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/97760507537.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/gugezomix.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/luseropadaga.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e9833edc18dd012d09abc62a3eb77f98/90424760672.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/sazazasotoj.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/8367695644.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cee050e73---gibolapepunuz.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/87758031779.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/jelomigotimokixifojof.pdfIn PDF document text
    • http://csp.hu/editor_up/gigutozimorovo.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/fewaxuvivoge.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161388274a471f---28357688854.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/xopilusobekopuduxijogu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/sozekekigovamubikolosut1631488644.pdfIn PDF document text
    • http://apicn.net/upload/files/22457795327.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 19544 bytes
SHA-256: 870348a6b63aad9e3874d17335800d4fc6ffb0a4df00c65605ab1d6e5490ab12
font_01_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 10552 bytes
SHA-256: 01a2068b9d861d3c535061111cc73e7b3163d4d5030f9f16cd09043a242d9f1b
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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