Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ca92c543a4deaf…

MALICIOUS

PDF

85.2 KB Created: 2021-07-31 10:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6cead9eeac44d5d473f789fc7bff2bb SHA-1: 157651f6c483253c74dc85bda7c6d76c4aafb298 SHA-256: e6ca92c543a4deaf47166b541bfe761eae58225dd6e5fedfc559a9728a202b3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or phish credentials. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious content, likely through a compromised CMS upload functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1be3f437---85193493410.pdf
    • https://narimasu-chintai.net/jcfiles/file/pezavowuzed.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/5e22304739117e557b501e90361cb735/65742261062.pdf
    • http://eastcoastbiker.de/sites/default/files/file/85979949828.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/85376261288.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160750306db77a---sanajad.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6a9318bef29b2940cf91a8f33a58af20/momamapuratigobim.pdf
    • https://markmont.eu/editor_uploads/system/files/37651357075.pdf
    • http://22743333.com/userfiles/files/9352564754.pdf
    • https://bem-sa.com/img/file/muzepovudojerorasa.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/vagawepexefibomej.pdf
    • http://www.aportecnica.com/imagenes/editor/file/nuzesil.pdf
    • http://apple888.vn/luutru/files/xotukoz.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607602d475877---bopavener.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bed7aab47---84792464750.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/lenudokologisu.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd2b2845b---gigovukuxinevesu.pdf
    • http://china-zub.ru/userfiles/file/fujikewemasisevuxevegow.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/48197865265.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ab0ed00f459478772e880414026b88fc/ziwozumex.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c203c9b9e0---97815851971.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6fce606c5ed3e1707f034fe6f3af8c5b/zozapafabokel.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4519a9f8d0---69807809723.pdf
    • https://cecprint.com/images/file/minikidozunowimevomusadew.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7ddbb1730---75419094690.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=organic+chemistry+formula+pdf+download
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72f.bin
a7154a4ffb6e7a9a22e398b63c669c2295fa418772e91d071cf9c4d956150207
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 11392 bytes
font_01_sfnt_off000101c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16792 bytes
font_02_sfnt_off000119d8.bin
219fd239c367d57634c45a70124adfa3735c2c967bdd5fa6013f5a92cb174d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 17080 bytes