Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ea9a06fedc76cf…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 09:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b00be9e017fa5755e5d659be2293396 SHA-1: 4c156d57eb56e23d4fe959c4dba9b090792648ca SHA-256: c9ea9a06fedc76cff672aa679108a964ac9ef4b7a0ec42b450f399aeddebe237
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and disposable hosting, indicative of a link farm used for malware distribution or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146355528899---61657091796.pdf In PDF document text
    • http://nadafashionbelt.com/Uploads/file/55007250814.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6ab2a1d5---tituluzawezesavotapu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/59848246290.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/gakil.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zapesi.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/67099803500.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/nemizojadoxigopozixub.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/ladumalelururavokutagono.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/wopunik.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/puwed.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/47604891972.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/818928020.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/75431647058.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/raganivofemudirekanerumi.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/28231639085.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/nikomuvukesite.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jedepagiwew.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/slcgj3vfbssemuvg70v4270vnhfc4mqf/vekununagivodigo.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/90936206824.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/loruxevotamolaf.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553b4dbd65---gesijotot.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/povofinavoje.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/48769585437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+transfer+files+from+android+to+windows+10+wirelessPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 10768 bytes
SHA-256: c3249efdeb58c6cfa9d9d5f568194510db2a0f6daf2dc5c623c9e2fefe7147c0
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 18012 bytes
SHA-256: 03b5d47b1b051450946e0ddcb6119cbbbb7bc030c81c746d75f9190fa9db3d17

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