Malicious PDF — malware analysis report

Static analysis result for SHA-256 108ffd91afd65a47…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 17:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7f5dbbb8ac8586305fb23344d97f7ba SHA-1: 1100ce69a1c7c36c041831cf2d3eb969e1534ff4 SHA-256: 108ffd91afd65a479429713967a4d67c346d61c2f8e84d89da1a600ebbfacdd7
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd07516a60ab3af901c25f41f09a805b/47878205401.pdf In PDF document text
    • http://coachhouse.info/assets/file/walutuwabadorilibitujoto.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/95667021803.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/dotubadirasat.pdfIn PDF document text
    • http://z500.si/files/gedav.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e045e946c---28498979880.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/xajegeja.pdfIn PDF document text
    • http://totoumi.jp/upload/file/sexira.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5970eca7---sojurixekuzixuzawaz.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/rawuwanevotarep.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/gogopupijav.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/86779691189.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613131a4210d6---20591778709.pdfIn PDF document text
    • http://gabortech.com/admin/file/13893407049.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/56300074393.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/galurupegoxitusesawidaje.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/7954117317.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/kewiro.pdfIn PDF document text
    • http://timebymtm.com/upload/files/94254647507.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kumow.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/14694139311.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/wemenokojuninaj.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/26018359766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=iron+man+3+live+wallpaper+downloadPDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 18492 bytes
SHA-256: 9f81b31071fe342ef9f0abe6313e03bc177430e8fec1707f0bdbf1bd9ef59f48
font_02_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 10564 bytes
SHA-256: abf3a76a1cb92cfd7f0b0551749d929d2979c12ea9685ee0c394f22d46da9fe2

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