Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e35c4756443d6ef…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 23:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 813893be98311adf866db669428136cd SHA-1: 4c03485c2aa486ceb1fc6bc8ef2540917d0b8849 SHA-256: 5e35c4756443d6efe1193c0c0bf14f8ebcd422f54ae1cb93b9bc0ccd6def3d1e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/losuzatukiwuxanotogib.pdf In PDF document text
    • http://bon-mar.com/fck_user_files/file/bagizurorexadufifud.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/90168181214.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/lubajomogavokuz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gb695ks1v11omm7u3hutjs5pm8/fovonelosi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/trd6l0npkff0cijf2ibukfot9f/bijozazijafanu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0adbbf2ce00f571c0225edfb337ba1a1/lumozebifelikivizu.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/34800592905.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/4154963618.pdfIn PDF document text
    • http://becucci.it/userfiles/files/94716480748.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/leguzes.pdfIn PDF document text
    • http://nprofit.hk/userfiles/37652399112.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210913182231_21paxh.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7d288bf8d4a58e63cd015f5cc8e7c524/67462516264.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/87848685356.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/69876680365.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/49534580301.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8f2eb804---rizemodimiluzunevipusujab.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/54932451543.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/51085801982.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/6015309377.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/13653181656.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/9564651485.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/jozirozos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=launcher+that+support+gesture+navigationPDF 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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 15100 bytes
SHA-256: cc2094a62d02d4da5724f8e6b31c840c9db1e91fab632b31a4f9fee99170c486
font_02_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 10728 bytes
SHA-256: 06d52beb3abb75a200369f1af4108a80b2eb5a460781e96e381a47d1463716cd