Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec551455d0d452ef…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 19:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bb89512a8a13cbb067e038a8d8ca9b9 SHA-1: 280f73304c3cfdfe53a8749c2cd1025e4dd315db SHA-256: ec551455d0d452ef56ea9dfb057fe5a7ef1d1af7e86760e25da0a26b47d3b44e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads or disposable domains. These links are likely intended to lure users into phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=cross+dj+pro+mix+your+music+apk PDF link annotation
    • http://wildzipper.com/clients/wildzipper/userfiles/file/23344033972.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/nanadamam.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/demisomabaperirufixaforap.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/42773596025.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b94cdf5---tanitofelinug.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/dedug.pdfIn PDF document text
    • http://abpaluso.com/upload/file/11182606860.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e78b265f0b---lejibe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3c6502254---5340525655.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/woxikafurusajapisubus.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/libiwujejabu.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xevugevuvexinuxu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/74910507965.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f76f931b8---82565434982.pdfIn PDF document text
    • http://prota.ru/upload/files/tokebupozi.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/20663189947.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/kinudubafabavopakesesur.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7ef5cd2e---risetiloxugiwaz.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/33964995652.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/xetetodezod.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/48322828688.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/64796238560.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/mojebesojatomurudosas.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614822d716405---zinuperefu.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/saxifojemomel.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_off0000b2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 10864 bytes
SHA-256: df77291894eeca09c0ee453257214df639a873ca3c2b6fc741b7f8a5d8371bc0
font_01_sfnt_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 16420 bytes
SHA-256: 708c1a47bf2d645efebb744dbf9d3a85fb58eb6181798647b7675192cd0b1e2e

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