Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a17f4a4ea18df9d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 14:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a436cdcd89a9a1bccd1ce4fd1992bb31 SHA-1: e2ddcfc4d0b8d48c4d5b918a065818156af7c9d7 SHA-256: 9a17f4a4ea18df9d081b97b2cecf17d0a623a383ab87e56a5332b440b8b26c9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the final destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9344ef1---41339118144.pdf In PDF document text
    • https://worldcastlive.com/userfiles/file/16029627314.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/73202465495.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c288de975---datudujetupefad.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kovofosusutabiraroragosap.pdfIn PDF document text
    • http://ukrfirework.com/images/file/39226197716.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wonunanaribojimoxa.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/46588806645.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210904160420.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/gitegodozuranujubikuwu.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zarovefemepom.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/56175081400.pdfIn PDF document text
    • https://comfort8889.com/upload/files/34751624666.pdfIn PDF document text
    • https://tonitomov.com/picture/file/zofumosufet.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuwitowofupexepijifage.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c107efc5---texuwavin.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/tokimo.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/4140917900.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/77320777005.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091115473973499.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/84534586805.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4f0a5fa1c---17590667062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vsdc+free+video+editor+androidPDF 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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 10456 bytes
SHA-256: 81c12ebcb29be6030a8da506b011fb4ca46283b1522964fda44f7359098a9ed8
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 20940 bytes
SHA-256: 005b5b3350a5644dc67f314aab834d986fb9cfaebb171c41ecfa3fb1d802bcb6

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