Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e090894b9482b3…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 16:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eb9ace93b25c27ddb9ddb9c4d6508d2 SHA-1: b3184c2e8160cd1fd7b5a8767259987633d4a2ef SHA-256: d7e090894b9482b3d4f10058c484377547d1df98711806f332abfe57597d56a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://archism.ru/uplcv?utm_term=andro+nca+song+mp3+download
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3b81fa15---mivatojotagejavigib.pdf
    • https://kaimano.it/file/vigodusovuxuxek.pdf
    • http://www.radanhorse.com/resource/files/26787040222.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169b7ebaab---dovabiwixo.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ae23dc29---mejiwebalogavurusigutitan.pdf
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/nitiwejewufebibubaxub.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/63679115405.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c3fb7cb3---76471273064.pdf
    • http://luisacortesearchitetto.it/userfiles/files/tolomakukizune.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/50422282380.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/09dddba457baf2a90c90e7c496977105/61592497665.pdf
    • http://adec-interiors.net/Uploads/file/bigepowow.pdf
    • http://dioblina.eu/userfiles/file/9900381553.pdf
    • http://edv-denk.com/userfiles/file/guzulegesopedirededimo.pdf
    • https://daqing-jewelry.com/uploads/files/202109012230295556.pdf
    • http://carbonelite.ru/file/pobipowib.pdf
    • http://massintech.ru/img/outer/files/suluvagivamezo.pdf
    • http://balaton.varosom.hu/userfiles/files/3354365065.pdf
    • https://iword.de/userfiles/file/54110469194.pdf
    • http://gerastar.com/userfiles/file/kuzavi.pdf
    • https://telewebmarketing.com/FCKeditor/file/tidopalufalodelefed.pdf
    • http://dalboncostruzioni.it/userfiles/files/taguxefinid.pdf
    • https://o-dance.com/upload/files/42645807533.pdf
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/57485085297.pdf
    • http://avrig35.ro/uploads/fck_editor/file/mewafexosumu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf55.bin
1aa0599547daa8d6b9aab985a22182aef93422b0d8fb963eec747c6bb521d1ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 10776 bytes
font_01_sfnt_off0000e7f9.bin
565617b9755d91f04fb7694362fc67c453ef69126733882494d841dd308a05aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 22576 bytes
font_02_sfnt_off000120aa.bin
d5285e1f164d91c501452ad1aa387851b7d7619edc90abb645260c5ed3480e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16460 bytes
font_03_sfnt_off000137a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 16792 bytes