Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49f074af64eb25f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-30 10:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a54e21429764d6cb6624c1c2508050d SHA-1: 79dae20f3d63047f61e11a986a382a3e9fe305c0 SHA-256: b49f074af64eb25f7af8584c2cf11c7949fdba8cef482d36abf7243662065744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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 https://win-win-keiba.site/js/ckfinder/userfiles/files/zosodofoxeneforezat.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d450a586bdd90b1acceb8d52ea0f7b0c/70589207456.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6794b67cb---96299480468.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/suwipetobiwe.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/10322090276.pdfIn PDF document text
    • https://protrialse.eu/files/files/budomenaz.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sorakeped.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/62340590388.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/dogajuxipefazujekejibojif.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/68361499832.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c62037ca7c5---mulunera.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/jimumijebuxefafaf.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/87605695203.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3f805b27---58773385019.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/rarurokudag.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/82915477bbba4967a1ecf9c9a43a74fd/kojisuwubibituwokipoxar.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/mogogodupozese.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/45725159512.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dce99a64---kiwafi.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/25523142454.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/34624657622.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4tqej0l99cpuhfflrh5jtqqlps/22501797393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fast+and+furious+present+hobbsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3cb13af3b87fb2ded6e32d781b076361/bogipal.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_01_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10764 bytes
SHA-256: 4b6a3aec7e805ddb7b177b114878eeeb99479fe7c297a961b0871350be4f900e
font_03_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 21676 bytes
SHA-256: 94a018a2ed36b04e214c1a6fc609782ce8b27bfa45afcec7d542cc93f07842bb

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