Malicious PDF — malware analysis report

Static analysis result for SHA-256 753b557242d8e8e2…

MALICIOUS

PDF

83.5 KB Created: 2021-07-15 10:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98b182d7078a7f31a9a5a0838faa8467 SHA-1: 22e0787cfcdac26484ee7c68f9867c31992b992d SHA-256: 753b557242d8e8e219886dbc0bd0034d27985050e48feded6f443429d639dc01
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafelia.com/files/favekezolupuweruwulevoka.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210621075311612824311.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/saromewiwenavar.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/26298405917b1cdf8fc08f3f5588a4b3/22600936597.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/38b4ee5092414294b7e001aadbce4663/81179975299.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/77125299909.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/41428376228.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e28231934d5aaa80989a861805455b90/74662324003.pdfIn PDF document text
    • http://mamam.by/upload/File/file/tokaxinegolubufejifuruv.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3d0j1ca9jgkkrb09nb9rfo0bf1/meremokonatibidalifazoz.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/tevetufotivulafafusafe.pdfIn PDF document text
    • http://groupkaishan.com/d/files/77553154222.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/41885460801.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tijurakiroron.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/14873263066.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a05a22f1d---39368010295.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/mupinal.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/mafepoz.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30e7276ed---pokuvipilinixijigusivix.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b58619dfef3d13e7cf558205edca7837/65263405876.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/gifumudujajozavapo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c111d3363db---71110221278.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/urnc33pkkosrfocs505c9a4532/36755626494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+and+free+pdf+editorPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 16632 bytes
SHA-256: 435a07291158a4afa14afaeb28f6681586540e12060c3d9dcdfdc9b029eda307
font_01_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 10500 bytes
SHA-256: a769359ed5b867581c2417c9ed187a489e1ae5aee3c5e888441e82445f117987

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