Malicious PDF — malware analysis report

Static analysis result for SHA-256 984d244a4e4f85a0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 13:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5f079d0416a2292a98d71dda8f49e2d SHA-1: 4247e6df836a46601fdcb6af5e8ca800d99491c5 SHA-256: 984d244a4e4f85a05ddcb35fd4c4629336812d962b616bd065a9f8a40ad5299e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The primary attack pattern appears to be directing users to external URLs, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://shop-ecobati.com/medias/upload/files/jexariwumoxipemufomo.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2d57d73dd909ed945837bdd94695a168/bumexarijezo.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pitepoluwusetujofijalorus.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/93346058226.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/30813759937.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/54495498514.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/tapimifiwoxalikabigaxu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedf3ac603---95629889678.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/86781949129.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/27138771743.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/nowepaduweguxumubum.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d953b55cf---jadetobumuvadip.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/45418577113.pdfIn PDF document text
    • http://specialcats.nl/media/files/99259186412.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/wufaragog.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/zumozagikazokijebi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614058f3201fd---fuwuwefozedixuw.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021917206137595.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/48701944824.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/bepeware.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/larafav.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/nolasabijajozopudaz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8b37838d7b78446174780d0327e98de8/sunupawazabarabija.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/dilofinebenikexojas.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/85118616448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=transfer+contacts+from+windows+phone+to+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_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 10888 bytes
SHA-256: 154d0a87c8be647d19a85f714206b158149ef51988a39da16a2eedf0c50c9a7d
font_01_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 17392 bytes
SHA-256: 534aa45c056d6aa84c1b8cf3ae02b109f7f5022b5e403591403c4a09a2587159
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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