Malicious PDF — malware analysis report

Static analysis result for SHA-256 980f1660a079ce99…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 04:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b96d02ed9c99faae784685e1f5959811 SHA-1: 873229ee252c0c3c6d0f93e5e75fa7a6a09dc25e SHA-256: 980f1660a079ce99ea95923a28175ed458480a9a8e333b456b98f060d9eb484b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, directing users to download files from various compromised and disposable domains. The presence of external URIs and link farms suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=download+xlsx+apk PDF link annotation
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/89659325630.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/gogedataxamavufu.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/79865234521.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/zulebivotivoda.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/72215151599.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/32901946342.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/repopefonololojevarexe.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210917080426.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/1921789195.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/weregaxegajojisiva.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/mekixolevog.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/dixewajubati.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/75344982077.pdfIn PDF document text
    • http://arucax.am/user_images/file/bojavepejeluxu.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/46291772556.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/movudosekusakim.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b801ff7f---lojekuwowofos.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e56ec5b23---jatedewubafunorototi.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/zopov.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/77151098648.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/bogeperuxapitoxodem.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/97932027056.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9770a5153f4f86ad6eb6fc4d38eb9e42/94824410840.pdfIn PDF document text
    • http://lse.hu/userfiles/file/2116134803.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/27158508747.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/rogubi.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/vutebif.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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 17304 bytes
SHA-256: de6bca64fd29758d8c21581f50bc1adebadff72f5005b6390ccf002f2681743b
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 10244 bytes
SHA-256: 5f3680880527033c06309ec6c02a427bded43ff4f7c7d425dc00c15346b61c69

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