Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ecff12db5e2579…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 04:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 253bc9f188f55a20a6c5472e4cc0a621 SHA-1: c156b340daf9b367beab19d2300f80ae49328949 SHA-256: e9ecff12db5e2579ffa2ca498de04021d5067e1722c3c97c64a8ff9e79844dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution lure. The presence of a link farm on compromised CMS upload storage indicates a deliberate effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • 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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/40146aa469a91decd41f84d04a5ac125/wisigalagizuperoxib.pdf In PDF document text
    • https://oddluzanie.net/userfiles/file/90067666765.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/boripolupadi.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/37318745743.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/10180465642.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612f0771cd239---vanolofejikidi.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/solipuvojubosevupudo.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/70030713055.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///15173292136.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/45521771605.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/biguladumusefunepub.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/66589414219.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/41987547225.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/93565402417.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/94896360637.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/67321757059.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/54152130154.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/28073359283.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161418eb643b33---lisipunokuxigovi.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/67988125209.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/12118814383.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6e6f8d6724f35965cb3525658cd4593c/didosul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+enable+cookies+on+androidPDF 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_off0000c191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 16164 bytes
SHA-256: 426d4d6e45e4625995f5f18c3bea691be68e0cbfba1a0327db748216ea6252ce
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 10788 bytes
SHA-256: d5b22d83c73763f810bbfce8784b11faa35abbccc86e0d548439430158866eb2