Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aea4c84a1ab646…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 23:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3a16990995b43ccb3a2b4a7c0f3bc0f SHA-1: 6322e3304741235715931212b30a3925c3986011 SHA-256: 50aea4c84a1ab6464c838883fd00e81e512cb6ab5dac36ddeae06299e135fc83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure suggests a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://presssimayeshahr.ir/pic/file/25222156368.pdf In PDF document text
    • http://golden-candies.ru/webroot/files/files/92601697846.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082502304925.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/41783393165.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/84289666206.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/14678108780.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/gejawipuk.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/totejelugububakinowuzelam.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/nagogomolofowobinulifasa.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/74601690216.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/fogopukufoji.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/32517893992.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba6f67415---35110350362.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/miwugosu.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/wojibizijifubopesiganiken.pdfIn PDF document text
    • http://theponghop.com/upload/files/78599329623.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/73032983271.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3979dd61c4---81335313233.pdfIn PDF document text
    • https://clove7.com/userfiles/file/50093858032.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/45072120780.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/sizepotulelorotukujemefu.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/1136713978.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8ai7e3k11dbu0idmofsr1hoi6h/7139751789.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/timeposeduxatudeto.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/49779977573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=passerby+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 22216 bytes
SHA-256: f88f8ffd1ee9eba913af1b5fc21f9683904c2a36c014b16e41233598b5d79b0f
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 10688 bytes
SHA-256: 6dfeee2a0b474c037715d97f74718674614b34b6e3cea0018d26fcac17fd2498

Open this report in the interactive analyzer, or submit your own file for analysis.