Malicious PDF — malware analysis report

Static analysis result for SHA-256 c035161fb7e57b2e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 17:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cc0bec35f737a7c6e9144bd4a74b4afd SHA-1: c7e969b6cb8ebda9a4ecb905b5f7b7be41e8117c SHA-256: c035161fb7e57b2e7dc86d67a0217bf8e0eaabd3d5765a42a17bb98d18fa91da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://elegune.net/files/galeria/files/potidunujine.pdf In PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/68366099597.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/wikobagoforemenukabatug.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/zolum.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91553022310.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dndl1j62qjb85q8nob0rfr15o4/44008323069.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/kibuxumigitiduwukiwajike.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109091025112393.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/788822927.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/dejaga.pdfIn PDF document text
    • https://polytex.de/sites/default/files/42347406554.pdfIn PDF document text
    • http://chinalabware.net/d/files/lubupixejadoxaxepi.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/29876580648.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/35507469805.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8a093190---muwugokar.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16363816882.pdfIn PDF document text
    • https://avflash.nl/upload/files/kupapiveruvufibebexupug.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8543b05f428e8d99a95a2c5eaab08d51.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/makixibefozuken.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/46055980061.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tepumexiwajeminep.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/folunabeduvofuteluxeg.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/mufeligigejidekipe.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dorabomigi.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/rukopolejunesin.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a41fdb468696f0921d91ec27ebd3479f/zomidevotebomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+can+i+watch+coraline+for+freePDF 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_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 10340 bytes
SHA-256: aa4f3a4ee8d2d9cfa2447864717c5bad4e97a7240de3294a8aa5d41a52260a08
font_02_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 18204 bytes
SHA-256: af8b3439a0135b9004720fff9137b77ab39e905be8fd2c9fe2ab36d0d7c7bb0d

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