Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a72b8501effdb5…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 16:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 299309f3b5c300b7e6b53e0ffaef8786 SHA-1: 1618d3e6a2fa1eebc5cb2d038e353240676b8b6b SHA-256: 54a72b8501effdb5f1a1ec9c292a8282b1bf45c2359e6ae1c5b8534ad92e2873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=watch+harry+potter+7+part+1+online+free PDF link annotation
    • http://fritz-fahrlaender.ch/download/taronumu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc20f17ae---64574214515.pdfIn PDF document text
    • http://yuha.be/_files/file/jufipuxub.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/dezadotapajifogobogura.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e867e673d6---tekilivowu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a328dede6---komemimi.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/37930765182.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4b810b8c9b0b182cc1d91fca84f56dd4/97684322614.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/58880494197.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc7774ea6---95426067148.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/26900620288.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6fd0ae019ee350b9a43e086ae2b6da0c/4937964082.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/41525589515.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994eb19ad28---58146419552.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13256579928.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1683c31218---99753714766.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/zubolozufilo.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210606183302_354704655.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vobafafazakilokigoledum.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/10v329muck2vufs8mfcsg02qd7/ximotumilurezub.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/aplegh1ep5nr25kc7bbs2t67j4/55089596269.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d372bd2f5a4---bowurenepamug.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/s7ql91c09rf7kl109tm3adbckh/57991325049.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_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 17460 bytes
SHA-256: 59f2f3ec51dd348de35bdcc2d222183280af6912c5ca27b35a2b33784b324b3b
font_01_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 10620 bytes
SHA-256: 7c4ebfa03ab3e1b890c66b2e102b36e6dceaa8cf4bf4c9b3b505f26047484fc6

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