Malicious PDF — malware analysis report

Static analysis result for SHA-256 6159a66683ba2844…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 14:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 809e8946406cf99f61a16b4c5c251260 SHA-1: f6ec3a30f1e192b6ac6dc61bf6cd0319ed7ea557 SHA-256: 6159a66683ba284416a54bfd31138e9d2e5ff5c4ce1e55aedd392d04a08563e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25416761e---64447078122.pdf In PDF document text
    • http://naoshima-habitant.com/images/blog/file/wupatuminolavuxolim.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d0173929a7204514f15a5fda7e3e8563/88185179548.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/migejelixunitazenoteduj.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337b8c2aed5---17974791349.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/xezoxuwa.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/fotafajebavadurewe.pdfIn PDF document text
    • https://mahae.hu/files/files/sirawokomidej.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/komisuwugisizanelizavabew.pdfIn PDF document text
    • http://effektfilm.de/files/file/98457890831.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/39979697232.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/lujidotemuke.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/jewepotekatajaxufaxeje.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/zavulilij.pdfIn PDF document text
    • https://cubic.is/userfiles/file/54348981353.pdfIn PDF document text
    • https://rajakedua.com/contents/files/14932063509.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/27432276752.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/dilodivozimosigus.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/fofoni.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/4377180148.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/72168966659.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131975e1bf23---mujevujoroderok.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/wubawefubujazowuzupase.pdfIn PDF document text
    • http://taociren.com/upload/file/210908212307587626do1t6lzncgit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=number+of+sigma+and+pi+bonds+in+naphthalenePDF 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_off0000bb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB65 11164 bytes
SHA-256: 0f3779c9b7099d065c74fee1c3476dbcbdb9d2fd429e9e3cdc2f81034a13826e
font_01_sfnt_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 15616 bytes
SHA-256: 57cf21ad09883d94d9f7fd55ac67df3d35b1743d44aca14b26f71220eb21833b
font_02_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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