Malicious PDF — malware analysis report

Static analysis result for SHA-256 edda324d321fb9ec…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 06:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 495472ffea28145c68661d904578a425 SHA-1: 3dd7c08df59663072ba3e75e266613d0ce3c7417 SHA-256: edda324d321fb9ec15a3be3785a46e22c146dfb894aee17d146629fa0200d759
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for phishing content or further malware. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160841decb2fb5---28648403918.pdf In PDF document text
    • http://interreg-ipa-husrb.com/downloads/79126409203.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zogakam.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d7ee24c10ddb6dadc096ebcc85d2fc8e/kigizozukiverujo.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/72242649646.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1f977371---panuradisopesapasumenafef.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/tiragenomonigotofate.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6d07514a---98642231920.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/29c47c7fcff5ae7972d7baa67931ca41/56058152514.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d35fa4ffe---81050788546.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/66467868560.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/zawofid.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d67e549619f5a5d32d13b4ca7bd18ddb/70164883721.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/kojumol.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/24a4e19ee190e2a5fd74b77ddd24520e/85810950841.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/tuwufibemavino.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/xoxujexofok.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/damafubuzefuwoluz.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/bufozibotonaduvotilara.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u0cedicfajl6ouag35msld8chg/54758195055.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16094303734d78---ridosiw.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b15d8504---vamog.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/menirimejupukiboduzok.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/volavefalabekopip.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/551246022ac6891fd84cb4f5b18fd3f9/60079578078.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ld20kgfvsdm9u5c81is8p4ru3n/86945925599.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1dd4964dd9b52b1f5f687e58945dbb9e/papefagumogumawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=biomecanica+del+disco+intervertebral+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_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 11040 bytes
SHA-256: fedfe6127ea5c5e4f8356ffb97a15f15375e3374b0d36d99586684ba94b30192
font_01_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 17676 bytes
SHA-256: eee3be6fcf3a9c8047f5762102f32ee65248117ff2b0fc76fe13a227c1d8e205
font_02_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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