Malicious PDF — malware analysis report

Static analysis result for SHA-256 139f72f6286c70ce…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 15:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0e58bce3797edfd4675b1d86d43333dd SHA-1: cef1578526dd6ea1ef3eb3dc8cb3ea43ebd3197a SHA-256: 139f72f6286c70ced4cc2dfa35b7f78cfb81ee1be5d6ea5beb6f9ab058e0138f
216 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://laborke.ru/uplcv?utm_term=release+key+android PDF link annotation
    • https://nadrozmerne-sklo.cz/uploads/10808846930.pdfIn PDF document text
    • http://uhorder.com/upload/files/vemekufosegubu.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/17615376821.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/12884894175.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa28daab59---jeralimaxedip.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/31627325757.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/84069893608.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/68024859302.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/47292208947.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c84f0b5f95fff27b62e26e2402cf8015/89123677881.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/60601368917.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314dffe969a---kunulisukugo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613399003834f---87227996325.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/97016451366.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/nejokeguwewevu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d267894f9b---74720082647.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/34993636837.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/jedixebu.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/sujim.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/vasulivup.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/69518601875.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/kurojipedunapivolesur.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/35867720710.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/pulabidowifavuz.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/bazegigadupino.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/65320659443.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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 16740 bytes
SHA-256: 9232e222611e8c85d66ef690133d36d034ada5e85f498e68e2a0fa6c4dd6a61a
font_02_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 10396 bytes
SHA-256: 57951287b5219e511c35df41c5750b2e853c7bc391cf0aaa9b300c2c8776c1e7

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