Malicious PDF — malware analysis report

Static analysis result for SHA-256 1725026b6bfe3367…

MALICIOUS

PDF

89.7 KB Created: 2021-09-11 10:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9e33b5ee9e2a554348e146cf39a009e SHA-1: 40fcf3f0b606e4a285b5a0f8f1bec674d23cacd4 SHA-256: 1725026b6bfe33672d7daac2e56fab4ca58a31e1a37874d338694ea2099da27a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://movie2book.com/userfiles/file/vixiwajibewujij.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a38b09b6f---54645020334.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff03eb724a---83951240924.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c88729bd24a0a6c057d9e708e50fe138/91710350545.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/sisasenunafezerojijexem.pdfIn PDF document text
    • https://wsbtitan.com/images/file/23463530346.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133263e098ee---986869625.pdfIn PDF document text
    • http://placc.info/up_image/sewuxafojifuniletifo.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/43942938884.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/73929004185.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/6425685811.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/pexadokam.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/517081355.pdfIn PDF document text
    • http://abwessex.com/uploads/files/mofejufelofoto.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/46054128297.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fonezusuwowem.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c988c7eea---peleluveraxikixiw.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jutofinelotepowabaso.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/27227385767.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/18847828345.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9694b9e5---55568412548.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/xuwikazosusosizonenobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=unlock+it+pdfPDF link annotation
    • 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_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10148 bytes
SHA-256: 71afbe50e11c2d5c3c509bfbb67e5343d083fb2ccad9b31e13944f70a66c4056
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 18904 bytes
SHA-256: abdb45d483f91c01a3635541d7ccb7b1a1b1a1cf89253b0a35fd3a0546c724c4
font_02_sfnt_off0001417d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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