Malicious PDF — malware analysis report

Static analysis result for SHA-256 80126dba3782f04b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 08:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e446233920b4fdd03b9edc9693fa20d SHA-1: a6658bec75ecdc87a898dfe53c7374cc282d407f SHA-256: 80126dba3782f04b15edaf408ce7383e77a04c95cd0dbd7fcb73cbef1baf4d48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=expressions+and+equations+worksheets+6th+grade PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6cbf82c91---94584136816.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ebjsu62cn2mkd40atq7mbmppsj/bolumojop.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/rogaxubotobevixigop.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/20290960387.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/54914323659.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/vopapodufuzerubawam.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/xidaxuxofireduzudiwalekup.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/sitotudapitabodizo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f8f4fe401ef4a6965018d73e360c568c/jokijuwomamani.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/7318800092.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/nasutojowa.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/kuvomufafekapurigivi.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sifudipogogevuj.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/26557216667.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/petunuketasonil.pdfIn PDF document text
    • http://weingut-suppan.at/files/21118517774.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b12d791fb93e33ff09c7141da9ccef05/10481793757.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5ab2c923f0efdef0275d974821b3bee5/85531878326.pdfIn PDF document text
    • https://ptogel2.com/contents//files/pixabalekemotutumitijugo.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/sokinitadebudi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2a9610c3537177f6b58915ad2b848b07/75380429867.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/kefinutobe.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/93227623344.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331f69d158---65776622054.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_off0000c502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 11300 bytes
SHA-256: 745f9aae7468741bd9ed39a919d0fd89a0d507b852e1802d8ce043b96de8aeb6
font_02_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 18148 bytes
SHA-256: 7cf2aba5ef5a02964daac95ed7131cc83e028ab20679471ebd1d1a42d267d33f

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