Malicious PDF — malware analysis report

Static analysis result for SHA-256 448183305ce048fe…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 09:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 631a6cbe3338d9a5a74b95d10c7decc6 SHA-1: 10f646a543e40069861c029a1a62254a82e0ab5f SHA-256: 448183305ce048fea1eae95e39c4d57d47d25297305031d6304715fbd01239f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=ultimate+soccer+football+apk PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bebce38a4---tefateroj.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/5150636278.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/40496447644.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/72351123026.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/80045170498.pdfIn PDF document text
    • https://coil.hk/upload/files/panakipijerekatemugizudem.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/bijope.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/96470613325.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lefivejefirokaxobi.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/40379938547.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/naxowe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lttn24icab1cq3tt0gu4q2d633/jaseva.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bccbd18482---207108984.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/bimisoromumavovodevawodom.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/gezorafizeravalufusuva.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wajalu.pdfIn PDF document text
    • https://equalland.com/uploads/File/21442491707.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/linasuliki.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613232aaf1c2c---39701121756.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/11203616530.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/90855491386.pdfIn PDF document text
    • https://topupdana.com/contents/files/14157560640.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xekiguzifuxurulexopad.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c4rq8thf8s0n38j32rthv1oer2/moxaxufa.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_off0000c0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 18236 bytes
SHA-256: 82ade4310a840d632833cd609ef07a596ed957a2fb781cd3395fe46e18d1cc31
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 10776 bytes
SHA-256: 5c094d0c22b0ccd5c5b5f2cf5f1b0ca8fb2aa6231bd8692b73ddd175c44928ad
font_02_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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