Malicious PDF — malware analysis report

Static analysis result for SHA-256 415f446f5ec6c767…

MALICIOUS

PDF

91.8 KB Created: 2021-09-02 17:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4711781bb47fe114ce92a47b7f18db80 SHA-1: 886223ce50ffdd6338060b9964d3a69a8d0657c3 SHA-256: 415f446f5ec6c767c18bacbe21de09ce2c5977854cd2d882a1c6ff5579a6e83a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely to host and distribute further malicious content. The presence of these links suggests an attempt to lure users into downloading additional payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5a6105cbd---bewibijorogumi.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/002e0ffc389acd994ad5f7b1e408aa3b/zuzarixavebokojose.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/muwekorusebolujudo.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/68160895620.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3577d1d9c---zezalenu.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/jatudikadu.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/pixujafaser.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/surejakolixorisumorolavu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94abe17442---18150469753.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/rororinisemivi.pdfIn PDF document text
    • https://mfdesign.hu/files/file/muxinoxari.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a6d7ba0c---91189383276.pdfIn PDF document text
    • https://alpinashop.bg/files/laruvav.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/sogiburifekowo.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vudagejejub.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/44304739824.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/ribekadifejelefurijefatu.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/rojosusimisuxabagasu.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/719989982.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lunumorubi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608519805c74b---nituri.pdfIn PDF document text
    • http://hkacca.com/userfiles/wixusebido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=great+gospel+of+john+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_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10852 bytes
SHA-256: 1c1d0985419549027274ab6f6a13bcb7be2e38de160fd30c37a993ce4aa59724
font_01_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 17208 bytes
SHA-256: 44143637a17fec2e68f56a96ab0d97541a09205088b3db3b28ef6242a9966489
font_02_sfnt_off000149b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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