Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba5fe197636ecf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 22:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40b9a050997b63237b27afe812c33c5a SHA-1: 13610f8fb49a8f833c73cb8cfd6e3374b1fc7f90 SHA-256: 62ba5fe197636ecff466a0d5dda5c320f8d5d1c1586aa54bfadc7d2280a48e28
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=android+emulator+for+win+10+64+bit PDF link annotation
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nutumowubivawezopemetu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4840b770c---16565135233.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/bozexaki.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zewaripixexetexegaxepib.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/s8ram8r80bpiabdonu6cmhpi74/xinileko.pdfIn PDF document text
    • http://chinahongji.com/d/files/55750123551.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/supevudu.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-05-19-13-46-djIWlAme.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/jibugoxadixofavelur.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/3481159869.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7311e2d---6856141863.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/11587534724.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/45569031994.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/mupijofiwiged.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/98354757511.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/43245003253.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f46dbcc478709176ace413cb39334c73/newibadojojenesune.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/motunevix.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/robaruvogilalinagovu.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/25098886931.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/88368441736.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/dusaboxarinaxutarexivav.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/304335559.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51db4d7d---55043699397.pdfIn PDF document text
    • 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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 11072 bytes
SHA-256: d875ea182c4f5b4585137309ab788d772f09c0da1c9f51da3e069866ba032d49
font_02_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16328 bytes
SHA-256: ec559b0e426021a2e3f80a289fc60025167c3fc43a2a086053e7cb552d0a2236

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