Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d5d1db0d34f489…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91c5896b83176b525cc6df93012ccf94 SHA-1: 7225fdcfe926aa34b530df2d0e21e2892d29ce6b SHA-256: 54d5d1db0d34f489e7055e80cc55277e4653779fc8d9c26c20961415a71501bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and heuristics suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.delaneyllc.com/ckfinder/userfiles/files/betotelojizekosis.pdf In PDF document text
    • https://bloc-immo.com/images/73813236880.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kapazemebinipujexubiganiv.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261ef2ad7a---33425723318.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/mafosanekogeledubodezaz.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902095745.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/93780380317.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/xajesudadurerarage.pdfIn PDF document text
    • http://scpt.it/userfiles/files/gulozukomemufa.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/vemapibuja.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/milixirixigixeronomap.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kekidojoligoponugiwe.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/moligavutuzekamelazeb.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/sozirepelovavunugagem.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/69453274985.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/85443292056.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/71026938276.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zopoweri.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/91663435051.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/zikanonixekola.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab334cd4f7---7341773045.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/100aef92e793ed9d0003871cbcc0f8ad/92460430559.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447be7a7d9f---1198214591.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/kagedamogijezubowotol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mortal+kombat+11+tpbPDF link annotation
    • 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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 18240 bytes
SHA-256: 3ad4f63adb079935dee9ff54272f2c477165043f895862afd729be86bc5d0552
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 10192 bytes
SHA-256: 1a368906b745367d3bcd930a420c8ed586ff79004ce121349b2c1df45ab3a079
font_02_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1