Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f941721593aae7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 21:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5193b8185dda8739bef66cf88d4b33b SHA-1: 68b744d485bf044dd81bec03850a4343aba81770 SHA-256: f1f941721593aae7d58d48e5ccea6ffa9917739bdcc19aa0e51cf332d0cb34d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports a malicious intent. The primary attack pattern observed is the use of malicious links to potentially deliver phishing content or malware.

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 http://fzsvybbs.at/userfiles/file/gewas.pdf In PDF document text
    • http://mindennapi.hu/upload/file/67949534131.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/92696301858.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/zekote.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/84960711145.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161405af583245---zepinaga.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/lizazoxidenej.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/zokijasu.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/bojagibowaf.pdfIn PDF document text
    • http://ijfbn.com/editor_up/33084271060.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613567e9211d7---69637609586.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wovipofavopanupopudise.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/46867146147.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/wozebumagaranevode.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/befafolosuvejogidokakabud.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/38912455434.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426d60247a6---90046025161.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec18addd26---jugoketudokomadesuveno.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/12204526188.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/30568922759.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/1722199225.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelijobim.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xizupuwiwisebet.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/67842734720.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/61750749687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+detect+screenshotPDF 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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10240 bytes
SHA-256: 78df16447679a862d327121182bb9c312f7e89e73a425c24a14bee2b5e2927d6
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 19268 bytes
SHA-256: 8cb7ec5f7633d2fafc1e586f7e3d3d4f68fa184d0a7cfa2bb0a3ef1ce15bf085
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.