Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a24dacf4fd11d91…

MALICIOUS

PDF

77.5 KB Created: 2021-07-06 20:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5bb749f8df11b5f1bc6af3f34fec5857 SHA-1: 6d09815f8b12af11fabac22b62333d2220cca48b SHA-256: 5a24dacf4fd11d9146e7d72f18b4ff6cf8826668d4e524b58c5c57fcf39f5fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and serve as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to dangerous content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/72ebeceb36b2e5cd30788e55c1a36e6a/jopemo.pdf In PDF document text
    • http://liburnia.pl/userfiles/file/buvufukazidalopeg.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/31187050910.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fc7h7gfp6jln73uh7639iq9f5e/vadapodisofinulefokuromis.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/43202731467.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2d5284ecf---63124508117.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/55295753385.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7139eca310---20936163526.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/5197959556.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/acef2b2ce0f5c22f8bb2ebacff828e52/jubevu.pdfIn PDF document text
    • https://bataretak.com/img/files/file/vovivisijipo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d7fd7539---vudozanovivobadajujuv.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/tq7mq9e2h7rgu398oibh8eioc6/denejevokutomuranatu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d5e39f59b79a3806b0259604147500c8/dikofuzesaguremazuj.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/uqai2i2ov4aaqg56cms7d0c7at/lavuju.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/72141225462.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/35173025292.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/40sli7ogi93kl3pldabf0nkjo5/98695088755.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nfcfu60d1nqp8rc5bgt6r4hsno/wufiw.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5a80527de3f4f4552acc588f94f64179/73988095222.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///37912424501.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/wedoden.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/31391425202.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ced1c1b05731b9fe6e52bbd49cdd8f87/821941332.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609de928ef819---20598281304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=begins+at+home+quotesPDF 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_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 16792 bytes
SHA-256: 66fb50b98d52500e6904f08eb1672a0919e351ce0600817660255508c11789ea
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 10708 bytes
SHA-256: 87ed8a95ad973c38332fa62096f208788a5114e1b107176addb030ed3842a82b