Malicious PDF — malware analysis report

Static analysis result for SHA-256 72efda44be2caceb…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 01:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 68921c709954610438f45d0007e0ee35 SHA-1: 56010a4996d110b8613a621291382066cf2e98ee SHA-256: 72efda44be2cacebaafe2081cee68cb1d8e121373c9ac8235295f0367eebee41
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ee55e2b431c---36127614839.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bm2q244ad14qiu2lpdvsrf4vfn/39924456165.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/9540036746.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3f7df72e---doxatowatogadidumuj.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/mupuket.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e31e6738c3a25420c648de0540c3df9/zekanefurinoxugirowi.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/padagorapex.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/feluwofiwelaxuwefadigiki.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/21772847963.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/28051158308.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075496e52725---95410613828.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/42658838084.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/degagepanuf.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/56016441763.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/vasabowojuj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608658c306177---3068660280.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/80549523685.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cd62b4ef---tutujibagijelukemavib.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/a6rg2q2296f1afp6b8paurafc6/74146359464.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/pikoduputapuzulipokubidad.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/jivojuvetaxalumoxu.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/fekitiporitixir.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba1d12cb3---71383639461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=metodo+espa%C3%B1ol+para+extranjeros+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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 21656 bytes
SHA-256: 8bd026198feb1bd26e4ba58f52cb8e851acfab68ca7bd2d1e2e09ce67bb0c171
font_01_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 10828 bytes
SHA-256: 271f4c59db45b687400b05dbd273e0d8f325ca67ae6bbacfb2d3aefb35645048
font_02_sfnt_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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