Malicious PDF — malware analysis report

Static analysis result for SHA-256 57271f2af0970eb1…

MALICIOUS

PDF

120.9 KB Created: 2021-06-28 17:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c0b74a86cedd270080cbc8fe2e87b30 SHA-1: 745c75fa197565cc46b2ac885d86508d30da89a5 SHA-256: 57271f2af0970eb1a4eb42a3483a7b8b30723c4cfa7ec31d20c1fc0b00007b44
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities within plugins like 'formcraft' and 'super-forms'. These links likely serve as a distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777ffb21bc1---fijolipisova.pdf In PDF document text
    • http://iwishop.hu/file/93901741857.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/93363838.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/33634334196.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mv43s984dpgh13gfloj39vidp2/nojigo.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9e59e2752095ed6dea5aecea4e13c2d9/vadobedinijozigavefuzazi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47030201c---zijavubudevi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24487ce8cd---rubebosapagexobiliko.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f298f6e7f2---pafame.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/df18327e895b704821960f6aa7a494ab/xigom.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/25onb5apjgj9uo9skp56cf4k8m/nironebomobelolis.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d34a8f76a7ee16230e601935bacccdae/zexapaxulilema.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41152562901.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/63596482377.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/96706694239.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/65148266560.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/038fdd64aa7a1b9166891a03d2452cdb/21738140357.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881e837d685---69898124295.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///gikodineke.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/41ba46f4c47af597e7cf60e9c98f90cc/92931340458.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c581a1838cd---14943733093.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/d2asiaqmqbvcu8rmfpv3q4glc5/pofubidura.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca33b3870e---zowoduwabivibezisuvimefu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f527d59b6---1138652343.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb6fd1b68---sumemidufumozolinezos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=structural+analysis+book+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_off000175d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D6 17712 bytes
SHA-256: 2ea6e08b4958ba40618df39e96a353bb7b088659e7e6e729e3d398d84ae34727
font_01_sfnt_off0001a444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A444 11000 bytes
SHA-256: 51b41a956afba3c57065404198b08c7fce87fdb4ce900d3f5aed884a341829cb
font_02_sfnt_off0001bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1