Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4e657cdaade777…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 19:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63a18cbb496dc86cd30d98ef8e849a53 SHA-1: 31ba6b18ec648d761403f34a68ba9a24cc9864ad SHA-256: 6f4e657cdaade7771dc027c74530eda3ecd421e1aea4cdc5bd22362dd22a1222
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable hosting. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://md-servicios.com/userfiles/file/vemazaxurisixutasetolomim.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b0c99f1---maxot.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/gewaka.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/94559301103.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/52006518466.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/worijugomexo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pepipemigekufoko.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/sebejuzowepafezokinoja.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/movarofezeg.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/filetajotesomavati.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/25412443591.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/15695016575.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/gazoxovefasiwus.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lmici05hf95auu73lfjl2b9l00/nanoganuzedabe.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/73891085848.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/6632237805.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/48001879818.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/2102566500.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045a72311f---tepigoselijutapajafoputej.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/48896981807.pdfIn PDF document text
    • http://caythuocnam.org/images/files/wonimiperedizomajikofok.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wijetuzerexajevurixosulaj.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0411941001631710184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cleaner+free+download+apkPDF 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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 18992 bytes
SHA-256: 6f5eb0dbf41de8584352ec7e7496b943c248d3ec2c5ede9a028d9efad63db192
font_01_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 10344 bytes
SHA-256: b76c4e0caac2e776f07ec9a3a2b4b8065905b5170e9d359d60c5b604a36e5b47