Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8d22f9d618a007…

MALICIOUS

PDF

81.4 KB Created: 2021-07-24 05:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62901d5d111bc91c185a4df5a25d6146 SHA-1: ce22f3118f4dbdac813fb8b3091cd1b7489f6498 SHA-256: cb8d22f9d618a00720fb539d605fc68ea05ff94bf36520e61e610ff0195e4320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, likely intended to distribute further malware or engage in phishing. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af6d429b4fc---kefuseluxalepezekigi.pdf In PDF document text
    • http://vizugy.hu/uploads/files/files/nexovotadofeduw.pdfIn PDF document text
    • https://x-software.cz/data/file/50622821770.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/88748112887.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba65c7d3ed---gaxotezejem.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6394e8984f---63961086945.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ddfdf0504---37449985472.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79b76b7e9---xetir.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f39e0aac5---nekaroreki.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f671644c93---42131242223.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/gesetuvisozu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wavisirajafu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ebc365641258d09e6dad8af1a9b5bd92/vokejizujetuvodaruzo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l55tva2u92kt1joeakds546ro0/bokanoluzis.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f451b51daaa8ba43bab3c91ed112ebd3/zixukatij.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/67252914946.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/96df6bb6523adf92729cfad197065448/63272560425.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/767b56a0399db1377dd42e4b1df49e95/gubejokatanopin.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/41750031751.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/tugubitevepun.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/46791198351.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/23609000583.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/69096934286.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f87b744cf---82538612338.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16268031356254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dependent+and+independent+variables+math+word+problemPDF 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10948 bytes
SHA-256: 0a89062ed486247b8bbb1ae10c4f9f52ae2ed9ee4d207945ebdcf3f3136939b4
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 17516 bytes
SHA-256: 5f9026d2293629acc85352974d3608e65e08357077f6dda43360342d009e2e8c