Malicious PDF — malware analysis report

Static analysis result for SHA-256 01089ef6c210a088…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 16:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ff50df51e59496650ce4079f76efb3c SHA-1: aefe4f63784e821ea929122075514ccc30d309c7 SHA-256: 01089ef6c210a08846d8a6961e2d3c52d968792ec22874413783763bae202294
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload storage. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://transturist.ba/ckeditor/ckfinder/files/files/nijezabal.pdf In PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/vugamajodobewofukibesuf.pdfIn PDF document text
    • http://soc-in.com/data/media/files/31756010911.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4819c9727---xibalolitev.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/sowawesosinuwive.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/00e3c2f8c1ca3ab5746b825af26eac1c/famugejitimokepeludi.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/varasilepejebo.pdfIn PDF document text
    • http://sro52.ru/uploads/files/lakomilagujavasil.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139719badcd8---93532410814.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/25312647869.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/televujexeg.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/65af04e2527fb491ad9ff0ef9af80304/rovotina.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/gomijote.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35f3815c2---roriwewasakakedekonupijip.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/59307302856.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/26471253091.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/tunagafafa.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/bejamedexovutu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/60700533961.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/58840688983.pdfIn PDF document text
    • https://proia.bg/userfiles/file/48246458169.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/xakuzilosur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mao%27s+last+dancer+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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 10548 bytes
SHA-256: 7bdfec3512eddb39f5f99dfe132e038379fdb04455011e0478f0f8b38d7c9cfe
font_02_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 17808 bytes
SHA-256: ab10181c1ac75eff3792e007588168eeb73daaf52fcaa9738fbbc2ce36d286a1

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