Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c77f142010cda18…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 15:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6aa37fda462afab43f46a2759c2a710 SHA-1: b082f578717ea71cd243199a3bddf46971cb10ca SHA-256: 1c77f142010cda18bb9e6f29767812e0df6dcc4c98a7ef6c87ef1d5b50573c2b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the document's structure and URL patterns suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ketchas.ru/uplcv?utm_term=solutions+manual+introduction+to+computer+security PDF link annotation
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/53c87e903f1da32bc8fe5b7513202149/viwidolegaroto.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0af1d72125fb7a0e264981d6cb1b7073/donixo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/kofelonidevavawexase.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/7118192513.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/zijap.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/34465034847.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a175d39bcd2---46285009122.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8dtub9m4s7dvc074aei99tc69l/pilikogeposibuzu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b0a084bdf---fixonuruvogod.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24598588303.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5d1d2b3e---4134299440.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/pujaletoza.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b801da03a3e553cfa585c30f5b7f9888/nunovi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96038b30ea---70968188822.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/87299319619.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1cb890ec1---74203752803.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16284455248749.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dab63eef374---ramuxodepisinamu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/bcf74c8ee2950f231e9ce37168b26dad/lalidotuledituligutere.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/maxunawitilupus.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/86c14b24ba6400aed4dbee28c1886653/jawusumojopimog.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077a41a8c0d7---91779570315.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/tulijulavab.pdfIn PDF document text
    • http://test-immo.com/file/52436558202.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/57145b66f601699039fcc4723a3eb40d/pewosefegelogozozaka.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/katoxuwuw.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5075313bfbf0c0466d3ec839c3709070/43409299429.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 10964 bytes
SHA-256: 4e1b863a1b6d277b83e86b6a58fd47fc41f0ce73bb01d5ad06e0ab0b74e3c734
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 17952 bytes
SHA-256: 83e3ef2f8c8752eaef44912cc60ba23b822f7fb7042971f9145edca4e7c4e776

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