Malicious PDF — malware analysis report

Static analysis result for SHA-256 defa7c0c06460d9c…

MALICIOUS

PDF

69.8 KB Created: 2021-08-13 03:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ebece0c6cc251fbfa246b2ce58f4d52 SHA-1: 641ffed14a13fb0e3a77cbcc62c434b7197ecb22 SHA-256: defa7c0c06460d9c0665c74cb445f99807e9cf02416d534fc4689c8a9207b2c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9717

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://oniceh.ru/uplcv?utm_term=what+is+amazon+echo+show+2nd+generation PDF link annotation
    • http://fratellilongoni.com/userfiles/files/76878258258.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/16518429243.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/jorenakavikeki.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/41539502581.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/29840918725.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/078fb88a8ec31fab080fb0a4bdeecfe5/77701384921.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/639152d5ede35bba194e0b68d8737ad3/fegalibo.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/92638173052.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acdefe3d574---48417481926.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e825556a---miwuwupaleguwa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bidkjsfhbo80i4jr2g5fvq3mfn/tasezepekunobebivulinu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8958f63301---71542876682.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90ea3dc6fe---93734670123.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/96938858116.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/1896598551.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d972a254---legebolodiwaludemukegax.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/673075800.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119ef99f82---2867306122.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/kisum.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/peloka.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6351826bd---gevasokovazejizebaka.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/xijekejegugevuwexafi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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