Malicious PDF — malware analysis report

Static analysis result for SHA-256 595b25e62fff4f01…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 19:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b00019a89c6b4f8ebccfd04a8fcd6416 SHA-1: 4519cdb321a802de587c7fb881445d8879f571b8 SHA-256: 595b25e62fff4f0101523611199e3a5cee07997fca56e8a7753266af3193a962
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. This suggests the document is designed as a link farm, potentially for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f94c4e5597---wasonadipifozozutivesidub.pdf In PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/56384282129.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e51cf54---fuvemedanenul.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b274d23afc---fogoli.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511797342c---fovozijukiwetuvak.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/36d6fba8085f1a381949daedca63023c/ritimaranexadupiruki.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/22640445982.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/051e6e7399f56ab250b273043636c74d/50028068524.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/jijoxizexabe.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43439982296.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/09c1e5c7e23ccef3586fc7702af5cf7a/24841570665.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba73ba42e---92358080250.pdfIn PDF document text
    • https://penzion-palice.cz/content/36464729589.pdfIn PDF document text
    • https://beaszemin.com/files/xebizinusutevu.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/83353999488.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/kulofaluxarewuvebitipamu.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/29413468480.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/41043818476.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/15856074019.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/soxugofanazubasini.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/dujoniverefitobozelino.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k9ves6raha4vgr71u9muv6oap5/momegojaduropug.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gvf117js0e3eoav90n7sdmo4ot/35300484554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bosch+serie+6+washing+machine+manual+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_off0000bb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0C 11376 bytes
SHA-256: 5b07787718924f72292e1b7a31069842d1213cce13f259ad1097fc5489571e4b
font_01_sfnt_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 16436 bytes
SHA-256: e232d41045a2a50b06333458e144f176371fa379fdc0a94cf0335d2126a39f17

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