Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63a299992149d2f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 01:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b4a037d055298b203a126ba644e4aaa SHA-1: 7045f90e7643248bcf5f1ded5002f7e9cf4002ed SHA-256: e63a299992149d2fd9b52bddddf0250f035166eada5873483eb8820dcac1f440
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a Pdf.Phishing.Trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, increasing the likelihood of phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pastijptoto.com/contents/files/78448457899.pdf In PDF document text
    • http://macautemple.com/userfiles/file/wokididitaxezibufelafugo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd3bf1cad---19444555862.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/zurutitinapenubov.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3be41d391e402741b679215f3a81d721/36295253887.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///87047691559.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29a7a401b---dogebefetekufo.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mapobipa.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/sebudupojejano.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/neroz.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/80ed26a717bd63b74ef6b43acdfa44ab/kemoramopotedofomamaxe.pdfIn PDF document text
    • http://biomehl.com/images/content/files/45221915776.pdfIn PDF document text
    • http://519pf.com/userfiles/files/mosepi.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/jusoserumafeguj.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d9aae6bf---nepulorurufeg.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde2f786ad---64693838517.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075b902a56f9---delafisununar.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/26479898159.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/jivivaw.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac2157e9f---3396628709.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3cd36ea0c5e8ac96268d3b7e8ec6633e/dezobol.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adc44b903---67878877820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=modals+english+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_off0000b58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58D 16268 bytes
SHA-256: 3e534b755d5cb70c956ac619723596622ea5655b42a12ac349a1cd531486bbf5
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 10572 bytes
SHA-256: 53137e249a3120ba9006df92e4fae276c7f18ac3e7cea13a780c87511bdc143b
font_02_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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