Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27ada8bbc18476c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 10:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74e27f200247a719e284b313a1746810 SHA-1: 0e47cc6eaafed0039898b2c018c5f782673f1c92 SHA-256: c27ada8bbc18476cc3fb83692009ff29e3a1e9701b9ea056274b4e971922a1a4
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://gammatradings.com/userfiles/file/fedutizuxiledi.pdf In PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210912140831.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/19978165081.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8de05f1e864dac2007ea7f2c3c685cd2/zadekiki.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gobirafokupi.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/62499318815.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/patakomamiritugixogibole.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e748190c3a406a69e06d5dbf3e4ecbff/japuzezomenuzisizalawubuz.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161379dadc00c6---polifutefujomamurimemo.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/91026369827.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/73918336625.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/guladakuzevelikeletijag.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/nidupodanelejulunaxoresip.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/56993648890.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/12361369534.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/famusolifotekejosevamoke.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/94180319804.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vevazar.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/73454314335.pdfIn PDF document text
    • http://goldmustang.com/files/files/fefemuv.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4809749ad---18144307654.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/63057271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=malayalam+torrent+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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 18544 bytes
SHA-256: 6e91fba3d90e78cc0d0bde6ff3ccbfd9f09774f70741be6c2ac7e8d08124042f
font_01_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 10344 bytes
SHA-256: dbdca621afb8dd3ac8b1ef5347d199de81599e29eeb9279b96a713bd03cd64fd