Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2aa93e811b1d64…

MALICIOUS

PDF

83.0 KB Created: 2021-08-22 03:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3b9eadf8a09f91b0aeb5436bb5f9378 SHA-1: ec104ee72585c6711827c30dd689beee4ab41891 SHA-256: cb2aa93e811b1d6484d02e54b761de42cfdcbe78414a5cea65c42bc3f3f605e9
204 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing embedded JavaScript. It presents multiple links, many pointing to compromised CMS uploads and disposable hosting, designed to trick users into downloading further malicious content. The primary attack pattern involves luring users through these links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://abnicum.ru/files/file/fijulugoju.pdf In PDF document text
    • http://sierrahighalumni.com/clients/878712/File/seliripumox.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88c93e8e---dizifetiwupokigimule.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609185d5c59ef---kodosexowijinonazokonowop.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/wiganagekazu.pdfIn PDF document text
    • http://airfa.it/userfiles/file/fetibuja.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d893662dc923ca53db5a69571784dfd4/75389598657.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/54813252113.pdfIn PDF document text
    • http://allasclub.com/campannas/file/mulivewefetogenizupoxa.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/42352785179.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/rapujif.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/26719938516.pdfIn PDF document text
    • https://roc.mn/uploads/files/mazozugugajada.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/sizepunana.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/gakebusowarozasas.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/93933488658.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/sekizekimedopisogakuboma.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/bedoronixilokebudip.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/mutebunukijav.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/paxifenoluzaxefig.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/lalanirijizirogalafivetuk.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wudisalakekotirinasat.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/94194457537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=callister+ciencia+e+ingenieria+de+los+materiales+2da+edicion+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 17792 bytes
SHA-256: e1d099f33403aa2795ea034d2ed246b352826c26bd9ee6e30713a76ae61f515a
font_02_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 11112 bytes
SHA-256: 515e7659c2449f938b8e7c8e2f25ff3119e9d06d265ef86de9dedc61446c083e
font_03_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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