Malicious PDF — malware analysis report

Static analysis result for SHA-256 546fe55a238dcf04…

MALICIOUS

PDF

108.3 KB Created: 2021-08-02 07:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 775dc09e8ceb2c9f283a8c9d3f9d6cd7 SHA-1: 1bccb950e30360ac484e0a72a5b3dedc217877e9 SHA-256: 546fe55a238dcf0494d96b48cae0fedc82396f6bfae4cb99c6b6e73480974b15
196 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 heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage, likely to download a secondary payload. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass gateway scanning by encrypting the actual malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/39f42g2g5uvq9jvukvil975j3q/65723820435.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1900e3667b977eb104fa65a26a39886b/73615584632.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/94031770611.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610510db9f992---genewobovejakavidapi.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/lerebuzodagojizokixobezaj.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/4732191134.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608117e2dc703---57217265864.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/g4dv3ut829m5vqm4u86q44ls2q/fidutusagiso.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2qo3s4ktm8se3i5q3o6bq7q364/tixaw.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8b777db3---sejewuw.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/pajaxiwikojirul.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609230df6280b---83959053543.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bijudoxajuzebufotawep.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8875b8a5dc634537577222e263de5c2c/gixiroditamibutevepafave.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f38eee7d6594bfc0ded6a96be1139bf1/46696542740.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/82352668144.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5faf9ec38---2305337881.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jd66pfnq9nku1339e9juoho2pl/82487939072.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6b48ca457caa37482e9be45c36eb443e/feluxudepitudoj.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160987744b37b4---gitodewodap.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b31d84d55---20876281461.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/246ded79a530aa4faefec95a711be87b/88026417044.pdfIn PDF document text
    • https://dineflon.com//files/nefibaputamixuwulez.pdfIn PDF document text
    • https://imgfil.com/1wxobxIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=veer+2010+full+movie+eng+subPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011242.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11242 20720 bytes
SHA-256: f963f3e5d43446580104bfab76363e82929a36b507c6841c72f442b98536d31a
font_00_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 10864 bytes
SHA-256: aec63fb21e30000697b54e5d51fa5f9358189eb0e917ab1169eda1a2a42157c0
font_02_sfnt_off00013548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 9684 bytes
SHA-256: 3618bc451ba90a7cc4895d9b08d2e9468cf8e50f65ded507234741c47b99dacc
font_03_sfnt_off000154ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EC 19988 bytes
SHA-256: 2f30cc961cfcd22fbcce853b7aab86153c4cd80fb03fe7454136a22e392243d2
font_04_sfnt_off000188a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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