Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c19c6c9f5cb47ac…

MALICIOUS

PDF

87.6 KB Created: 2021-09-11 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2b3b8f103ceb32f5a86d0b1fdad872e1 SHA-1: c6a7597c09e9308432ef4e07221de10743bf63fa SHA-256: 8c19c6c9f5cb47ace493f97f9e766d495dd7ce4a96215bbcd59d48110ef5f693
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.bargiel.com.pl/ckfinder/userfiles/files/2083279898.pdf In PDF document text
    • http://tencanpowder.com/d/files/65467078307.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/54784115973.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1986362be---pusib.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210909050256.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/81901575101.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/40624852060.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/30109718929.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/naginuwoxe.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/jopuraxiner.pdfIn PDF document text
    • http://skupka23.ru/upload/m/tedokije.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/fotaluro.pdfIn PDF document text
    • http://sparkpro.lv/content/file/tavizetedeji.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/gesumodoko.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/tajokofegas.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/wolisuzajegulobujo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8aa30d60---12668448282.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1817de10---76067779163.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_6F82DA092AE2B60C.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c76905ea7ce169a512e92bd280dd2687/raladavotarora.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c0f2b7913---38383136217.pdfIn PDF document text
    • http://inercial.es/uploads/files/62973401154.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613251991a1f4---51319373345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wps+wpa+connect+dumpperPDF 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_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 17608 bytes
SHA-256: 3a5126a071b4009e429163b7b472cb3cc19f812c0b988fb9506bb368eac1ab7f
font_01_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 10716 bytes
SHA-256: 4e1405bd205483ae2dc64d9679ee896aa55bb2b5551ecd2838f9ffdb3de155a3

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