Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1955ad51d72cf4…

MALICIOUS

PDF

83.2 KB Created: 2021-08-31 13:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9084b7c25a7c0decbcb049e203bc94f5 SHA-1: d5aff7a9625efcc48e992f7580188a6a02c19291 SHA-256: 7f1955ad51d72cf4b78eec2dc810ded86c8b5ac2b5693bd1f4c5603cc8e9f739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external PDF files hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing campaign aimed at delivering further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://smidgel.ru/uplcv?utm_term=office+manager+resume PDF link annotation
    • http://master-sign.ru/ckfinder/userfiles/files/52284190515.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaf22ac32---julom.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/tapiwi.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/wosarezul.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1828a8dc416c4922960fac583627b723/44022636612.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/69986374160.pdfIn PDF document text
    • http://biomehl.com/images/content/files/104646275.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/bekogajudawokumerizus.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/zurokagarifibov.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27e446bcd---dasodomaxewel.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/60180407572.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/37973592009.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210630061037.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a22f6227d---41731940783.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/85811415096.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/aba988bcef0018b00640f0972bb89754/xojijufoxikasarulosugilog.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/edcf9490b848a04ad4a059be6dff6f72/segekir.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/10ffc984fd58fefc3701fd5554cc895b/weniwu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/bozerozoluwu.pdfIn PDF document text
    • http://kgmda.com/upload/files/surebubijokibezusewosubod.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/6829904657.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/26898253480.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qkknr6bf30f8vcfglm3uci3sn3/juvifinivoguvov.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///25660069043.pdfIn PDF document text
    • 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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 17332 bytes
SHA-256: d796bbebf70fc732ba65ace16e5eab8377a9ea2f76656e12f81ef6c91a82493a
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 10540 bytes
SHA-256: 4e43d9c0a3e528f7296eb9924ca39a96b035921fe87261899196db97d8e99413
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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