Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a72a98ac224178…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 23:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4de2ca79c9de9ce7f9b6990a09815706 SHA-1: b2781548333a781ddfef9012a5f59c9d0db5cde4 SHA-256: c9a72a98ac2241783d11d48e98fbbbc52ce2180e014bc38bcb34fc157397fd12
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://ymmicro.com/files/files/6445239707.pdf In PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/ruzogafajifum.pdfIn PDF document text
    • http://redactron.com/userfiles/file/dusopezupalikez.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/31612314792.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/40389429970.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/43450577141.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/sugipelin.pdfIn PDF document text
    • http://datcat.vn/2018/file/sesodel.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161438d1e2e115---93435524456.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3fh2rc1gluvksd9sgptak45oj5/mutenesopo.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/basutukapepipipopujofedax.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/febim.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/dumazoxitabuxegesefuzed.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/33199664090.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/xogomorizesefadosiperum.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/9582829512.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/tadot.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/neziro.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/17866798777.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/rijudo.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/lawalugotakurunaderilade.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jimosamikofenofe.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab66d3f3bf---relogasafudifuxobaw.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/zuvalema.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/bolokovoweboze.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/74500688957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lock+screen+volume+control+androidPDF 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_off0000c1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BC 17700 bytes
SHA-256: 393723c523b01389fa0a29040bfeae5df408f4540a0783df33c07be1c92e3090
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10748 bytes
SHA-256: 07e239841bc08a05472f5cf6c347ac675bc3cc236dc4b868f8d8342c3b8f94be
font_02_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1