Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3667f91a8cadcee…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 22:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d00613e0f8187d266d9a1773cc4cbb7 SHA-1: c472b713230f33c3953a2a4fcedd423110552c34 SHA-256: d3667f91a8cadceeba97c9dbc4fe5bb90f30adfe57a49acd6631f28daf571681
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits multiple indicators of malicious activity, including links to compromised WordPress sites and algorithmically generated URLs, suggesting it is part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the intent to lure users into downloading a payload. The ClamAV detection and ML classifier strongly indicate a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • 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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8fdf8053f4b8771849909b4443398d43/gufobumeso.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b28b1ede9---wusizoxepisoba.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210819032337.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/wujub.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/ditikitezetifesadewed.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210803_849FA7941BD54D5D.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078406aeb5c1---rojafinefozifipusu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf2ba7a33---gerilavezonabir.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zozexopukugerutar.pdfIn PDF document text
    • http://sinoorchids.com/image/file/jadebudelino.pdfIn PDF document text
    • http://svx.su/ffile/file/tukelodosuxupiwolok.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607454601461e---jiworogunanapudagumo.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/39511479267.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/1608135646.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/ginaxidenewusuve.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/90571989061.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8382f6689923668597fd3681fb82ac91/91716826660.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u5j7avrnn1pc5badsdo49n3nr1/tezazudajavitajure.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/9272344344.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/63d318d544dbead4fb21d6c7b08fb48b/16126315381.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/37109594160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chrome+download+settings+pdfPDF 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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 18012 bytes
SHA-256: 9d0d211949a840e6e0974d1e5ad35e79735a19b96eb9af702931e7d1c8fa606c
font_01_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 11060 bytes
SHA-256: 01db5793cefb4a7763c9a1cf28861b3ae9f270b922b416f73901a5e78fd6abe4

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