Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6ce923c15472ec…

MALICIOUS

PDF

98.6 KB Created: 2021-06-28 06:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76229881e85aa31b481e5f503423826c SHA-1: 47cec297223b66c77187c149e578a9b526ae96d5 SHA-256: ec6ce923c15472ecd4f9175a6285b11e259961e6d66a693b8ccc01dd1765b71e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to host malicious content or redirect to phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://medvor.ru/uplcv?utm_term=north+point+ferry+to+kowloon+city PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a371ff7870f35a4aef60c1ee5f0c2963/61657933625.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/67312615620.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v7m8pq490j5nfq4ivvsh6kucsa/nepafidutupuxafotenusef.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2185b9aa7160c6488a2aa5803c9f7757/saledigugilotugol.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d099f355---pazotigipavodedidekusoda.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/75c4a2b1b52e0e10075b4de83ffab0b1/69302904135.pdfIn PDF document text
    • https://everestart.com/images/stories/file/47433242599.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098657d6cd10---xejuwogudukaxakipilofin.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0a614a283fc4ea3daf12c1352eb47271/gexugegefuwe.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94046a33d---73347450792.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/suxuludejularut.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kefaporedek.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901318af98b---38280880430.pdfIn PDF document text
    • http://elijasprojekts.lvfiles/file/51128886169.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/nevebejanakiwigo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3lgp7nktqmf7el2mmo4kgutdf2/puxubaret.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f47922639155dd0b6b937307d6bfaee4/34676309781.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/70431526448.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3jmsltb3rflv7tnqlnpfu6obtn/31164517641.pdfIn PDF document text
    • http://texmet.pl/userimages/file/53999507947.pdfIn PDF document text
    • https://fallsplat.se/file/60090519460.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba4e41f14---wemirirajok.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb66333dc2---34448260962.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ib1vp9jn1ehgpcvqlkqklqhc6k/gopilafujitisulogijofekag.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d322146bfe8---mimis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 10516 bytes
SHA-256: 56cea6f88ecdb220c811bf4213f4769d5b911fa334115d55e55333d078d5004f
font_01_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 17712 bytes
SHA-256: 0280c9238744d54c12cab155ff4804780de7985d9e6636f797f4b9a248eeab46
font_02_sfnt_off00015248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A55 5128 bytes
SHA-256: 50febdef449a950d4bce7bd9feae5028b81fad23aae3e3d094c8b305d52aba2c

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