Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4152603dbdc7cc…

MALICIOUS

PDF

75.7 KB Created: 2021-06-14 12:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f1e0c50e2f6f05bc4834db275f144a7e SHA-1: 308cc14d8727b9e51cb6904e237513336d57e087 SHA-256: 1b4152603dbdc7ccaba015fcb577a24e1bbcaf51d3603a51d755b3ce204a843a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack that leverages external websites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=detective+conan+all+movies+english+dubbed PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797d30618c7---79293941460.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340c030a7f---38877361177.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160841f6ff2647---90299553443.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gk2ct6n68rr7pr876emn43gq2k/marubidolavibowegu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/c43ur3e7dfpbpjhgm67q8fkfom/mekifawiledopogejuxetedi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608517e78596b---sipaluner.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ce28c5380---23719189231.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf502c796b---simezemediluzegusoz.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b36fceb882a51f424a93348515636ad8/fofitudawexufizedoxe.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/igmtk0k11untunj0bmtatb0sj0/nejaxodisog.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c348d38d6---zezujumoxen.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/rkc3verddu6jnmecdki5qmfa4v/xigasok.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/depigekubukidajela.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6d320223---vudizudorumitapezaf.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e46d9525f---52439678448.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/56751283513.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d8b734ac---nanugasomasezirov.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/dtqqni0rfh3347vfcohjjv1gib/rebowalixilamofewudaxuzuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 6552 bytes
SHA-256: fa8a9deb501a110124a7e49131fe0e9ec01297ae9b91b8fe16faa29139f774b5
font_01_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 5456 bytes
SHA-256: 00c1f03d1902ba0ced66cd077a699c46a324ce814a9e720e1fb86a349245219f
font_02_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 10644 bytes
SHA-256: 3f457310c85c827ca58b28fb7f4e138b501daa2ad0b18b7526fefac4d38cf8a8

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