Malicious PDF — malware analysis report

Static analysis result for SHA-256 b620c90788940f3c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 20:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 666f6498c2ded0c3fe60660733d97ce2 SHA-1: 5c329d0c8950dc6bba46861e68ffa3c3e294c693 SHA-256: b620c90788940f3cef7ca4aa745018c2c33825ace3376a614bcec61aa285c8ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to facilitate these redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=pokemon+gba+with+mega+evolution+download PDF link annotation
    • http://unibeauty.com.br/ckfinder/userfiles/files/21102421925.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/peposidu.pdfIn PDF document text
    • http://www.520amis.com/upload/files/linag.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jorafekubivadorefo.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/midaxusetatimerabu.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/92250553284.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68682533135.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f414c0f---vuzovanekobifa.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/rokumege.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/7467850798.pdfIn PDF document text
    • https://mediaskills.rs/files/xamezixi.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xazomogal.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/92734525612.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/t4bslik3dk575oinp0lrg1chu0/31849643024.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/67461295533.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/70673649243.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/dutizunoraku.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab152a5bb0---bavusebugitijula.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/dijekigonululiliwovexesi.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/19566224901.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff488d7f0---kibunibuluwekiwob.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed534a56f2---92118298150.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/53706322892.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/17192263241.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/30200584541.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/fawujukajidesefitun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40d80148---fatolotawoduvanizito.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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 21916 bytes
SHA-256: 0ff4cf861d190002e5e15e11ba1f3bc6c04e87f2aaa5c39edfede83b67770fea
font_01_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 10912 bytes
SHA-256: fae6d4d36404748017ef135360b50da50863d4ae9bbfc92dde589ceea76002fd
font_02_sfnt_off00012af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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