Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf450bc67b0b86e6…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 18:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81a16437aa2fb6514c7130437b295fdd SHA-1: bfd38a639a4d6112c9fde88768ff408952b1f3d2 SHA-256: bf450bc67b0b86e6a906d118400d46fbc15ab45099280bf1bfd3e09d54b00137
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831f9613f7---13702094908.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/9pj2ha5efvu2g7uggnhjbfqam3/genipozasulotemoturem.pdf
    • https://eurocomm-italia.com/file/47313493269.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fc7e80c63a66872204e25f9cd43167a2/3938613703.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/sudugosavirosuxovepisi.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1471ckjjunt14kofhlkg213paa/gelifomawo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c93njfkgv5v8miqgl4934a4l5b/sijamafipepasebip.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7ed24989---zugumuleve.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32701738444.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc6a03500---wedowod.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2de9fc43c2d8c284b460a5d048ca261a/betinanuweluloragux.pdf
    • http://boschvietnam.vn/files/usersfiles/files/powopero.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/lekilajasakimalodegis.pdf
    • http://pekingtogo.com/uploads/files/tevamogapad.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7f6e87de---69312787322.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/danumipofu.pdf
    • https://sakkestadbil.no/userfiles/file/62926907700.pdf
    • http://simonkuehner.de/gfx/userfiles/files/72384913728.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/01bdcdf001e4d68feb16e09a5c2d2b58/vutemifapeguwawozedutoj.pdf
    • http://chuaphucluong.com/uploads/image/files/94053532740.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2be61df4---wepamojakagutow.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/56384214391.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=can+crackers+help+with+nausea
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/daa00037b6c2bd01ea4962f531ceedeb/lisojisikovopepiguwufum.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee56.bin
e7bbadfaefc91af06ce12f9d09416ac765ecd0dd3726c597531649ed1d3b8cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 17208 bytes
font_01_sfnt_off00011b29.bin
b04294d905c0f4dbfc2b0069e781127f77f933fffcebfe124a0cac6f3c299536
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 10660 bytes
font_02_sfnt_off0001339c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 16792 bytes