Malicious PDF — malware analysis report

Static analysis result for SHA-256 4120f507908ea049…

MALICIOUS

PDF

82.3 KB Created: 2021-08-17 12:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 73a663b7a36a618825d1a2501acb521c SHA-1: 4cb84a1c41894fc0def3144020b14b54ef644081 SHA-256: 4120f507908ea049e7dfaa759e5df586b24de7c8c6ae92716dc21858e975cce7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=far+cry+2+ppsspp+android+download PDF link annotation
    • http://goodmix-psc.com/userfiles/files/jugenavemodisas.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fndsaok2ggt7gqk9k83eqq2d41/mefimovulemodabotenol.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/rujije.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sadazowuj.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/74713695118.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/gijuzemaxuguvuxelenaveten.pdfIn PDF document text
    • http://lulanjina.net/upload/files/vagisamuxebimegar.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/masifafunageruzi.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/salavurexarogumilumowijo.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/47691283048.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079372f517b5---lugedekuwop.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/zafeporipumijefisuvabut.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e524fbeab8c---78759995067.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f835c464b8f2c1ac07515d5e3cb5d498/xoziruterapi.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kivesu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2f381033---jixuxezajapinijax.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/jolomo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab3885f05---puzawikoro.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b392dcde---vufozunadowofenasot.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba48138cb---goluzevuxovovavezukamu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16100374e55c24---vidivivilokizel.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/minuweriwodexe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161040a96bb570---36635330984.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lofuvutonikokobimip.pdfIn PDF document text
    • https://p87.hu/files/fujemubu.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/41547700043.pdfIn PDF document text
    • 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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 10576 bytes
SHA-256: 2dd4144518686f3ab3ddc81a0ea4acc21362f99b1e0aa9354f018c1b1c04ca98
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 17324 bytes
SHA-256: e2295b6324dccb95231813d3cd5838dbf0a66453c1f850bdf4a5d0f693254284

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