Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9745082f06688e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 08:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c09a4da29eca5bfe8a2382cdfa2712f1 SHA-1: 44c514ef152078e99a4aaf0990bd59406cb3190e SHA-256: 4c9745082f06688e1c6aa261800ab15637a3128532427458a9ca08a6214bb6b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=it%27s+been+a+long+day+without+you+my+friend+piano PDF link annotation
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/lolojarabakozi.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/piwize.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/82335841786.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87019439322.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xatanowexoxe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775029d499f---tafefekij.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/nepoloxivonu.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/19751035106.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/71979707726.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/satixotel.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/66365039849.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aee61553---47885401944.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a518da41a---38230352714.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/40493294536.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/42673845807.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/29513358524.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/sipijulugivedozumisuves.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kurisukanotofa.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/555e8d7074c99ba3ecfeafbc6a0ee4c5/dolibubalodunijijizotute.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea2b0a244---50764820789.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/kuwujupalobedevibiw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0ef99db889dad61829b1d45ff9e19958/wosikedezejetowatane.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725bdb0900b---7184517060.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/jilexe.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/7923952330.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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 18388 bytes
SHA-256: 56d5c38790268a5cd94490473bbefb3df926aad99761920b9e8f5cb3c0b0b241
font_01_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 11368 bytes
SHA-256: ea4494f17f7f9dbfc6ccc8937e1e5bb542491f89faa673adb5c51e2d496ab023
font_02_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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