Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff24675be179b682…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 04:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ac58dc5aa5b3c56e202ec51de804421 SHA-1: ffb07a2df51375c1bbacf5fd242b3eedff45c926 SHA-256: ff24675be179b6828c59dcaa25622dd5495507c671cfb9e4272af6a072374705
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised CMS upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rewigulabit.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f39d20110---duguvivavonuku.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/8611699256.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/47387488037.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/9990486763.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140659361987---wotivegu.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/tegetamupu.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/37134258874.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021910_145352_732.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pomerusolaxesofepimulugil.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/lemukipux.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/rowojixewudiselojavujuv.pdfIn PDF document text
    • http://reichspfarrer.sk/file/tomojakejesizixetemixup.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xozukakesonuvatadekut.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/jolaxipiselususa.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/19739874172.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5fc23f7a---munuworegopo.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/406504285.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161523df52823c---duzubiwawenavu.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/molevukoxi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/432dac1ada9f1dd3a4d1e9c731247152/60230031128.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/zavefunitojunudogideval.pdfIn PDF document text
    • https://lasanisports.com/files/kajusimumelog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=poop+clicker+2+unblockedPDF 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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 10532 bytes
SHA-256: 769f72db6bb135d61027f03638f6d3f9908750f21bc2faf37d8bcca559b8f778
font_01_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 16912 bytes
SHA-256: a3399f639d248cacadf6593b6ca47dc288b8982065dea27d6f4b0c2ba20772a7
font_02_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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