Malicious PDF — malware analysis report

Static analysis result for SHA-256 333fcb1618e4eef3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 08:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54065e42ff8547d23ba7e6c59560bfb6 SHA-1: e412df0b37141333a8a7814b8d570a4ee7c187b4 SHA-256: 333fcb1618e4eef37181330af8a50eb381b27497f786ee5ef628ab06e224976a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pistant.ru/uplcv?utm_term=how+to+increase+taming+speed+in+ark+single+player PDF link annotation
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/82890418509.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/vakufurajusiwep.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210726024608.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fc41149e866c771a47e6ec702b9912c3/12954055155.pdfIn PDF document text
    • https://premiersuli.hu/files/files/bazipujekubaka.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608535af49fc9---rarev.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/fomobajes.pdfIn PDF document text
    • https://citytrafik.nu/images/file/24547283872.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/forubefipuxewa.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/4245853799.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210808061516.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/nurewurozigafomixesofejuw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf7840643---jezujovabivunuwovup.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/58778356484.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/mujisuw.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be372b5f7---26729642046.pdfIn PDF document text
    • http://hotechike.com/files/files/13712968338.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4ee7816c583ea10d171fe01cbfc9c127/80466508044.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160e3539eeb158---koweda.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/votowobuzizolenerikizivon.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074badc506a5---tivumoxoviw.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/26457976055.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaad2d7e55---15487256249.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/49238518471.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9be44563---60457491141.pdfIn PDF document text
    • 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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 17720 bytes
SHA-256: f56ee53b8f29e269d88fe927c0a4822ee14dedde048fed1a0a7b89cad7cc329d
font_01_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 11140 bytes
SHA-256: 7cd382aeccdb0db22c467f1d2d9f9bd03d4244785d5d2b2a5c935a6884af3cf1

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