Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac97334bb3c7bd0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 04:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03de5f4dc989b790d94e03d54185d59c SHA-1: 9c1f97e97cde67addd75ed4f9e4282202d61e9df SHA-256: cac97334bb3c7bd08e492a6d62adb841da8660bc8e688e81e48ec7f4ffad8ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for SEO poisoning. The document body text and embedded URLs promote 'best pdf viewer' or 'photo viewer' lures, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://imdad-egypt.com/userfiles/file/dilexolasigoverovub.pdf In PDF document text
    • http://mazdooradda.com/userfiles/file/94598508658.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/4466694838.pdfIn PDF document text
    • http://weingut-suppan.at/files/21274673920.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/79131305607.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/44347396262.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16307073566720.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/pugamunetufojaxidalazak.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/gikorusi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d75e0eb95---fomonopukigarokazemejur.pdfIn PDF document text
    • https://bnovum.hu/downloads/gasosotebifiveturos.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///2951592344.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091121152973499.pdfIn PDF document text
    • http://rhondachem.com/d/files/fupodisamakawisamiguxo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613284498467d---felulumatufevuzuvef.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/63039640164.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/36976852758.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/95435036104.pdfIn PDF document text
    • http://grandfiltr.com/files/file/36373951085.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/42945455692.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/80661816248.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vuj6os36keoi8v0j8idl451cn3/zezumo.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/77146615705.pdfIn PDF document text
    • https://timminsrenovations.ca/file/r61xChbAehXVpCmq.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+pdf+viewer+for+windowsPDF 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 extracted file (font_00_sfnt_off0000de08.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000de08.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 17868 bytes
SHA-256: 65b0131dc4c614ae0080ed59312d0fd00f42e8a08adf8e93ccd27dcb52759f13
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 10488 bytes
SHA-256: 2a23d36ea084bf67584dec4b79d0f27e60f60233beeb5548210a7068063d7512