Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b8e719b7a4bb49…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 12:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0228336134f38fdb5f4249c97f229cf1 SHA-1: 3241806b06a91be741f8df3364036a1cc9fd6df8 SHA-256: f4b8e719b7a4bb49e84e8ed33fe25d61f8d063ae7712434f0ce228772bb6cc4d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary URL, https://coretry.ru/uplcv?utm_term=dynamons+2+by+kizi+mod+apk, suggests a lure related to game mods, likely to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=dynamons+2+by+kizi+mod+apk PDF link annotation
    • http://www.salpasafarit.fi/tiedostot/files/56444741331.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace768d7db---jinededupovojegugazexi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4e809d6590708494c324059d17809023/67046603449.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/2878353334.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/3764792953.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/tijulipusuriduxug.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/pefaritefekimujovepa.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/zukazaderadumakixoga.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/85132753839.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/3201328141.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde6586167---vulagetixij.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/50751978490.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136410dd287c---fidaf.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/54731184873.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/senevoleguji.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/55708011039.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/rokebowurarumamev.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cf998549---potifetaduripasasetiwo.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/97501489449.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wuvixuluzifasajez.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/serovesejidurewetadewisi.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/36029775992.pdfIn PDF document text
    • http://innotack.com/userfiles/files/33541554383.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_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 10704 bytes
SHA-256: f55497c3de9f6b382652e1d1bd4140ca5419956a70efdcbb05120f7a07a63565
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 17312 bytes
SHA-256: 25d5cfa86aad75fc6b43868b907b67fdd3877783c373c9b6c75bb061f47325a1
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1