Malicious PDF — malware analysis report

Static analysis result for SHA-256 773892c4221750b4…

MALICIOUS

PDF

88.5 KB Created: 2021-07-06 05:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 50336f72c02df70849de69107b30775a SHA-1: c6e2c63c94f40352598ced23fb829787c7cc35dc SHA-256: 773892c4221750b4fb8fce2896181e7917a5a6660c8c6ffd2d137ac4c130bfbf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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 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.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/27f6colv2990dsnk1bsh3i8kc5/77326793366.pdf In PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/356o63802s74l38lsp21i9r3qj/bozisarovunadazosiwunawam.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61a4e54353---37418349673.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/36730432217.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/xabefedevagipulewuzatel.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210522053339106.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/87509445299.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ca2b1cf2---17112365942.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210624054856558019jin1fitypv4x.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a889688781a---32282066097.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/55582650153.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d82cab82---32776850870.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed4262a47---38352696910.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/20164790232.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/786f059e976f104d13d54d32450d0605/17461290387.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f72d81c68---61756314834.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/fuzulemikowibixupolofilen.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/tutek.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a35cc8c650be5fb9f3d75ea9916fe26b/xofumirogijag.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/jepizi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0578c05d88---62427565136.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052719511773499.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/922911d01948aa5c557d30a07dc4a3b2/52848800015.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb15beab75---82192703961.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dt5ns9p10n19ioicen7cebd514/96445971118.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160797800aac29---jijebesixaduvirisijurozi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/35c33f8146e08f16749cbe998905a86f/jaxolalosixepis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=interview+questions+for+civil+engineers+in+building+constructionPDF 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_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16524 bytes
SHA-256: 0ea1d6cc148b41067558738b5a452157736e4c254080297f8754ca6d482a74d8
font_01_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 10980 bytes
SHA-256: 7ddf7d047b7f96d90374ef71bd3bb70d70b945b2fe418a4006d2eeb165657d0c

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