Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ef6de93997045d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 07:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0167f74b6c9efba21c27f4b6990a1ea1 SHA-1: 6d226281a57cf767578be6d43f2f365ddd71a5ec SHA-256: 70ef6de93997045df052d81d568a788758d81d43f1216e1eada7bf964e6362e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users to malicious destinations. The presence of these links suggests an attempt to deliver a second-stage payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://gandolfiarchitetti.com/userfiles/files/18428545720.pdf In PDF document text
    • http://photopuzzle.net/userData/board/file/vazupiguxamajesa.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/d5k456p3opcehalaq0qnfs0jk4/6311723715.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc98de4843---zigitaxetebapurawe.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/wulobetazutu.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/jagasixivaxeb.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/67795313988.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/82931344637.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zufuw.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/vavuzubal.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/84143297050.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/tujilalofotejezeferobu.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/dejemedodejukuruw.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161324e73c9004---kajexadiv.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5a99a18f---83671606017.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/bakolo.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/15296053962.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/33717675959.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/10417678581.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/sefezexivemawugo.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zuzexijubupimunonebolajo.pdfIn PDF document text
    • http://ccsl.asia/files/30414032274.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/vadinumoranudel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=followers+ig+gratisPDF 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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16464 bytes
SHA-256: 12a2ee460f01a7ec80a9a2aac7f4db83573a02b681f3c28eb677b091d4a12404
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10240 bytes
SHA-256: ad0b55cf4ebec71315626daf3e45b7be0ba3e62401152be80d5f7aa1514cc15e

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