Malicious PDF — malware analysis report

Static analysis result for SHA-256 43504158df5a3160…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 13:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6508b0b4b233ce6afdcad83691877b69 SHA-1: d0bb1e70b154ac983f43c799289c95eed2475486 SHA-256: 43504158df5a3160a78a226042938017accc2b3137d48d1ea18a899203963136
176 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document's structure and embedded links, particularly those related to 'uco bank loan application form pdf', point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://studiofranzoni.eu/userfiles/files/jexiba.pdf In PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/godaxobudidonujoronewi.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/49374405071.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/40nt69v2n6rp34hr4gillrnt1a/42794142698.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/70953518916.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0f3ef44e9a5508ddb2da8deb4122665a/rukadaduvofirekikarok.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/60884063384.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d6782594---80863276304.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0cf75602d975ed473e96712c7418746b/lesujegapirotaju.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/nikivena.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/50s6a75glv928jd9r4cek5b3oc/70999302014.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161013200487e9---zidavapined.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b503cbb0---nisetepo.pdfIn PDF document text
    • https://terracell.info/images/file/zonoretiluz.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/wigiwejevitide.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104b0d3b2617---dizijafuzavik.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8834a43c1d---94769851059.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fk8sd1c60np1ih35s7u5cogrm4/26093153282.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa47d742c4---punodukesurimozi.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/8783775576.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/repifokuxunif.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/feruvejogesarom.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160784054b3267---jabudesuwazuvijapobefivu.pdfIn PDF document text
    • http://yilip.net/userData/board/file/85594186271.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/piwulunoseganeweza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=uco+bank+loan+application+form+pdfPDF 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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 10720 bytes
SHA-256: d871c497af48fe993acd9e110716a33320241a9592541d0d6468de373eea4d9d
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 15908 bytes
SHA-256: 0872696f2436e95222f68e0d2d933e4a47bfcb4adb1ada398c35c2fae1b17a2b
font_02_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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