Malicious PDF — malware analysis report

Static analysis result for SHA-256 930c32436148a8a4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 04:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c662b05d59169a8efb99602224ebf56 SHA-1: acc6c45e7dae6b1ba274c941d7314c50842189b7 SHA-256: 930c32436148a8a4d4f7e02fe5428e89b95e32ac016f540f8c3d09107560d2e4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to numerous disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ilovestory.com/upload/file/situtareboditonogik.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133550cb92f7---50874601265.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/sirunojo.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/suzufakuso.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/pozagolexenevidi.pdfIn PDF document text
    • https://stopserv.ru/files/file/jijoxuduxafuxejoxapomi.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/28996608010.pdfIn PDF document text
    • http://sjhtractor.com/d/files/mupapulopisivo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/kcftcdl0dumcto6i4adlf4oc3d/nexalelopetikibaparima.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/62344252462.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/2273750590.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/78797487957.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e71fbdc13---50584577990.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/kukaminoni.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1da397a2---loxanigero.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/79246807999.pdfIn PDF document text
    • http://kustari.net/userfiles/file/95963277918.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/3537118161.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364cf965e64---70058883014.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/dirozorutumukital.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/pevurenelunaf.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/kogavu.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/6960696429.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/89903357717.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/jerukixoxumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=world+of+chemistry+textbook+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_off0000c1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 11060 bytes
SHA-256: 9f113b68ce578f60684b90888b088f8a7d895852d0bc506e3afc08eca8fa2ac4
font_01_sfnt_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 17056 bytes
SHA-256: b326071d057432ceabd55b0f060f0baf80692819b18fd06d234f6a786e3d0d32
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1