Malicious PDF — malware analysis report

Static analysis result for SHA-256 3736c52d54620448…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 10:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbd5f00d57e0c25fbe5bcca69477bedd SHA-1: 792dc67373c567a6644ac3eee100f79402a8fcd1 SHA-256: 3736c52d546204485cf5018f1a9a90d790b1b1e4dd4a18b34a7215ae2ae2c109
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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://gpp300.fr/userfiles/file/22873658122.pdf In PDF document text
    • http://movitecnic.fr/ressource/site-image/files/84640637773.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/fitotozevozaxixuxezitijo.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84769037521.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/58037871675.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161403a9e6d206---jabifuwoga.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/629113537dcff21e6c2b8d31167450a2/3406909405.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/17960060616.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/44849114704.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/40904478562.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911145131813574.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xutumo.pdfIn PDF document text
    • http://speckrepej.com/upload/file/lujatide.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/beliga.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/12139260938.pdfIn PDF document text
    • http://yejida.com/userfiles/file/38763425207.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xevisamemexabo.pdfIn PDF document text
    • http://budropol.de/Upload/file/wikidivuzake.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/befewabukokajaforigojikuw.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0c7e5d93---nexiwibinakujivaz.pdfIn PDF document text
    • http://sns.hu/_user/file/sujuzaju.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/sizolewudex.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/zibow.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/92730768008.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/lepalapipuf.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314748f3d5e---98267404312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+close+appPDF 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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 10392 bytes
SHA-256: c51f331f4e27057695d09f8c6486f8e803c3930efbc40555b342e38827cc0ff1
font_01_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 19056 bytes
SHA-256: 94c67442d3205551b4477f73d02ca622c6b3860a0e38c7a261384f59421a68d9
font_02_sfnt_off00012d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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