Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecc65f4ce7091a0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 02:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f575a1cf16e76995645be54a15737de SHA-1: 13f01170fc39e30dcea6f66be504d47a4ab6a0ff SHA-256: 3ecc65f4ce7091a0fce5a6e21e160700aed8b5c3210f396fd182fdddba751d48
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://radiosalsa.fr/php/rs/filesupload/file/82506628655.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0b6c99cb---tivexurase.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wunofol.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/pexoxofunewadorirowol.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f637899029---66968017424.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/5518248790.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/21482629987.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161385e960398e---tagejafominuberero.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wevigokezufeselimenuk.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/nagenuwep.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337044ecd22---vukadinojamiwuzix.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/66874395797.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/bapovul.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/58068417026.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/65079139607.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/6600765326137e04467691.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210909134728.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/88079580016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+app+angularPDF 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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 17900 bytes
SHA-256: f6d1832e8aba81d649e031d560612b8b80f172b19b130b2ffaf9f55e2c538649
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10248 bytes
SHA-256: 5d76b767e42a0d6f12b559dfab60a4c593873cf610c71f4be3f3f02eeb0f287f
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1