Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0c77054339c0c5…

MALICIOUS

PDF

106.4 KB Created: 2021-07-17 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3dda8b27de663b68a056335c56bdae6c SHA-1: 9aa745fba52d9a866f6d868174d115c2e6fbd544 SHA-256: eb0c77054339c0c562ec5b94958b64ea245eca828275a2bb70221cfe4fbe8c05
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a large number of URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for distributing malicious content. The document body is heavily obfuscated, preventing analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

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 https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//79876604149.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/bkoi29vep4v9c58gb0srfh8qj4/kisukaravexanado.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/55405844202.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5e764d2fb6c444235f908731c631e1d5/molenarokekenuvazesa.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/mumosirofevo.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/59641104125.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/212615879160e8049257dd7.pdfIn PDF document text
    • http://mamam.by/upload/File/file/86213824843.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/39temvov09g27ar421nht6frh5/35780476384.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a84bde01f---fuwojofokebopebu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/bd62301753b7eea5521e1572788dfa48/87229125567.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a9e9ee992---kalopi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ff036fef3367e44addec6a0515e41e23/91762046470.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d009c97b0ff---97322660417.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f13e0d3b34a58c96c617b4c4abc6a606/sexikukaletatefi.pdfIn PDF document text
    • https://synersys.fr/contenu/file/seretezujewapepemawo.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/18529504974.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/14768186404.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/758a7r1on0q0qb5hges8s7fhvu/fetufa.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9ae4897e70e8552ebc8d79e6984d071e/18341903674.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085536439c59---mevurowatorujuvurokuk.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/mezekox.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2e7c2ee564f24192eb2b6fd1e0e89422/48905189440.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077de6dcd003---xubakopobudiguz.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/17553315671.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57a0b46c5---derugetumibadarejosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=facial+features+of+thalassemiaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 19732 bytes
SHA-256: 1fb740dc37217ea3478002466a7add19c2e749f0356468a5cca551ea5ab6ff16
font_01_sfnt_off000162f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F7 1772 bytes
SHA-256: 88f54c55e7c62323177d1498dc7524a1fa130df842d6b8e2f46fb3f5fa4c94ae
font_02_sfnt_off00016b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5C 10576 bytes
SHA-256: b029da35531908e119959de20ecfd71a7ba7ace46cee2df850746ee99ae8b420
font_03_sfnt_off00018383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1