Malicious PDF — malware analysis report

Static analysis result for SHA-256 a172c6fb1ecd0dbc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 19:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53b8154c4fa1a08e22d6dc394f7c77a9 SHA-1: 11a6e2b3fdd65e7f4d6a1c6ecb4888df7ead8338 SHA-256: a172c6fb1ecd0dbc30c56d677c42cca7db5181496e6eeef2d5a338810590a81c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and link farm structure strongly suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=go+to+activity+android PDF link annotation
    • http://artc-polymers.com/upload/images/files/48766608329.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/zegokisevisuwas.pdfIn PDF document text
    • https://webaprint.be/img/file/rosodizu.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/nezoxeraxekavabubijosad.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/75699267393.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/1123979454.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/73751327461.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/38245603436.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/18939045019.pdfIn PDF document text
    • https://iohrp.org/f_files/files/36433643313.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e54d419ad---30319073569.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/nikelira.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/79813675931.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e76d5d28bf6367ab4d3bb184cdc387b1/28885676716.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138a68f85854---botexubegu.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/88745598147.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/bobinejevakexexotipek.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/lavijigapavolexafutesunaf.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/2626258921.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/zijuratur.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161465ea866a38---28426687710.pdfIn PDF document text
    • https://adikkedua.com/contents/files/donizipabovogutajuxoxa.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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 18640 bytes
SHA-256: 5939e6e41de16820e804a0cb4ca9d313ec1d3ca5727d13a3e57c6ca675bee3ee
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 10236 bytes
SHA-256: d035bc668f065c0fba6fc4248c06c334098eedb814436af051caa8d0b5b209ad