Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fda97f7abe45ce6…

MALICIOUS

PDF

77.7 KB Created: 2021-07-15 19:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 48a1f795b690ff75e6ad25a9b822f1bf SHA-1: 388735d11b54f90af1787ef71e197d54763bde59 SHA-256: 4fda97f7abe45ce6aa06eb0654041729441782809530a0fb650e30c9cc825def
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting sites, likely serving as a phishing lure. No scripts were extracted, but the presence of numerous external URLs suggests the primary goal is to redirect users to malicious websites.

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://irlanc.ru/uplcv?utm_term=manual+for+at%26t+dect+6.0 PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jinkl77crll9rgt0f48qinkcbf/63251143661.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/gizalonevanado.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/13628880458.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c64bd6989af---dukitowikinana.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/j77fhs0uen5oagvst5ervocaa4/30910533753.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764a0af3c6d---70126364280.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4591fc59b82e7d22e259e223dbab5c21/65623972962.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/nemaj.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r1iqt5t35hsuo558irdi3ftei8/65902007207.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n7a0jr0gud975jltvuo3vqbt85/70278636139.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210626_194420.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/vuxazanuf.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b686a48b5ee---dakomedanogarumawi.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xaxifesog.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/tidobiwafetaniwapi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/q1f7mhroqgd9tj3iptrma78vbl/lenoluzaxineraguzusi.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/46863877154.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f0e6baec4862cbf77c89f0b6319e8987/95262406307.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/jenuzopebonedifi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecc6190ba9ab4fbf91a34a26c4030d51/24560365934.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xajilegimodinufugetevit.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc18041d5d2---20831760745.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425df39047---73812365961.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/383075baa53175bcf06db18535356b5c/xosatimekopamugafokugi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b1a8a6e09---91999446758.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_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 9908 bytes
SHA-256: eedf7688591b517c21975611bb90dea73a9f31733abb252d1077713ac273938e
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 16028 bytes
SHA-256: 2d305e21ef2c1ac8567e775c6e27d354fe21b8086aeb87322c486165b2312862
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1