Malicious PDF — malware analysis report

Static analysis result for SHA-256 487aef09077243cd…

MALICIOUS

PDF

97.3 KB Created: 2021-09-05 09:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4dfc1da778361aade95bf1c23e1d00d SHA-1: 0762517a8e00f851f7dcfa987fc927416c36de6e SHA-256: 487aef09077243cdf0a3bca3ebafbd97d5cfd3215aa5c2eef96f6753ca739eaf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring campaign.

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://huntic.ru/uplcv?utm_term=dinamometro+manual+crown PDF link annotation
    • http://cn-biyoute.com/d/files/jipuwul.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f36dad21b2715933324724fa5e65e258/jugurinadafuvodezonujel.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/nedisaxokajakutokizifev.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117d469742a8---15645114924.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c2804b17---kogesezeledetenawilepane.pdfIn PDF document text
    • https://uangraja.com/contents/files/nojidet.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/15860424212.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832aae9a796---28851352473.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/18153045607.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/bowomojokasixozenuku.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/73f020.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16114555263ec9---dusesekofevutetelejugoju.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612524d67cee3---35617927267.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9dbb02efc---nulewabatavugenumodafami.pdfIn PDF document text
    • http://rotang.net/userfiles/file/73943154189.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/faxaxidaremugixuzalutir.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/xuwokidomumimu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce69f8d4245---juvoguw.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/xuzunikave.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kopubukuvigajo.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/61665446354.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/148ac5185a11f510d875a3e7f2a377d1/90319686385.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f3jln0ji75epsp7o8dvthllbd4/gumigedaxasa.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bimemukalenapobiw.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_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 10408 bytes
SHA-256: d3ea6a6982311267a2c3c675a81024d061e0540d9b3def516f5a8b95060ce4f3
font_02_sfnt_off00013fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBA 20892 bytes
SHA-256: 5901ded3d426085ef4b503808d903bbe4979bafbe8a13cd9bf47caf377d3d00e

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