Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92de6919fd68554…

MALICIOUS

PDF

136.2 KB Created: 2021-09-04 19:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fc4bff524c1ab9f7fa297440a1f4d3f SHA-1: 2922b6d7fc5343c7d1f13fb1bcf9734db4a6a11e SHA-256: e92de6919fd68554b879e4b845a4f0811f891bf87949f53f1e9b0e51b01a4d25
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the true destination and potentially track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=derecho+penal+objetivo+pdf PDF link annotation
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabb6a736f---vinalorasod.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/12836338260.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/33748454868.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3389b5e01d---kitugasidaxixixe.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/tekufugagogoxubutiziv.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/14073730170.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/wirugawupezop.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27ad5929d6---lowetodetuzetadidoxufe.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/eud81rdla43j01l8qa0bg9sap2/fipimaxugosexafuwano.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d935a0d6f9---kepuxoxagazupe.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/27547410533.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/42117906236.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e855c7ec987ce00537a08d724794bada/12626408.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6ea609c5---janomel.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe0f8d411d---47772231663.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/59669826568.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077660c866a4---26986214175.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/26320616511.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4ifru9g4dk40naemei4usl6k05/xinuvubovuvise.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb83ad2966---63520976427.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c6a6f74d5fa9bac1d564b5ac819d8a75/47382770740.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wakonomakeredafovaf.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_off0001ac9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4AE 21468 bytes
SHA-256: 6837218a3e15ff888312cc08a131007abd31d20eaf9621e37f04bbfe0a747d2b
font_02_sfnt_off0001fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA6F 10884 bytes
SHA-256: fb84b5a0d6d31e2a428fa47e3d2235afde1e9e3ae8913556f09a91427cdee072

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