Malicious PDF — malware analysis report

Static analysis result for SHA-256 d346d2c9766c66b8…

MALICIOUS

PDF

82.3 KB Created: 2021-07-19 08:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed6d7b18047a5e2871fb8f7f60c7beea SHA-1: 4a85179a0f7f2c2c8d7fb591c90128fc39581dcf SHA-256: d346d2c9766c66b8ef392151bc01e8fd7e5707f011aa2b58ab633ce5dc317741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous distinct hosts and links indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/b0v9vhv23n31b7k8t3l96sn0vg/xonuvubepobawi.pdf In PDF document text
    • https://wagaskar.com/media/593095357.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/15068544460.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c738b435f95---rotujezubudozaguna.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88837567---46385650342.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c048ae800---novuritivejimisebonov.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b351797c---rusazidig.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/fedekuxabolemowis.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/21244922384.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/pafigigugisutekov.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/24026320350.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/pojunidata.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/m27nqll8krrt1q3gsh1ncmoh0o/wakinoxinake.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160949db38598d---neforajopodididolaf.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/muxuxe.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/limole.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2htgabj5vg444364ijh9asmtv3/kogorerajilurevatudeve.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v3upq363gloc1m5ms7h18e2ipt/nesonuwibenibidoper.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/86886256510.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bc81c31c---15037530502.pdfIn PDF document text
    • http://matras-devison.com/upload/file/87836137341.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/21591929818.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lrjvrfe7ut7c4qco0gpofv8k0g/54788938724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+force+binds+atoms+togetherPDF 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_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 11012 bytes
SHA-256: 746bd448ca19852e350358216f34fa9556129229c0cb0e26ea4ed6dcb354d92e
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16796 bytes
SHA-256: 20323d650acf570206c985a818bdc2ac9bd477e40ea093d20f6db7437f4ee744