Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5aaa0a1e897bb5…

MALICIOUS

PDF

108.3 KB Created: 2021-07-04 11:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 880eb887bbae55245c5edbfe54fe2f65 SHA-1: d8f9d2f379f63e51354266061f85468ad21dfc3d SHA-256: cb5aaa0a1e897bb53319def50da6aaef8e622c067cac0be4e0cd2257f132dfc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/vkh9pmhbv01spmfludftecoug3/4721199475.pdf
    • https://geniodelweb.com/file/sorudiwerimepiz.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e61c708e7---52561585886.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7d57ffe481570f944e86c8fe99e39a9a/28960695598.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0be177c6---48964391558.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c37ab2f8---45917113215.pdf
    • https://haysalon.com/public_html/userfiles/file/xiraz.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608243e807206---repufowulusegizawov.pdf
    • http://teenmag.cz/userfiles/file/wigidilud.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e7778a6d---2398078643.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6puuqg58fno1mf1meik78adr4t/36543918539.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f159a2dda---34166310952.pdf
    • http://hoadon-dientu.net/images/files/65745408271.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d55963eb1306d2ae839352b4ed5f27c/pononidunodozefixadumofum.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3099b0a64c---rumamarunepuviwoluweludav.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa095c0a4---45029215519.pdf
    • http://ahcxdq.com/uploads/file/070933057339.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/81kq1achhcpt3k0cc0ibn5fc78/92610327066.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff0cd8bb08077b0ecdfd3391609591a5/36041750549.pdf
    • https://alatheir.com/atheirwsfiles/file/xereniwepibogeb.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/5qh3j6evjcj6l53mam9pjotfa4/73352453914.pdf
    • https://ancoraeducacion.com/images/fuvibabipinab.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/601rsac4sfkkr5v36jho3qusf3/63719116165.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7k9prrvo9vsr82bpo5pd51vfop/30860992.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+sword+and+shield+rom+hack
    • 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_off00012b73.bin
5ce8ed81dc5aa0ad67208a9260cb511c2885d9325d5ef14057c95e745ea4a270
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 10716 bytes
font_01_sfnt_off000143e4.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x143E4 16164 bytes
font_02_sfnt_off00015956.bin
9468e57cbe81c1e8ebc784c66183c98340461937cb10227a2b6099fd05880041
pdf-font-stream PDF embedded font (sfnt) at offset 0x15956 18172 bytes
font_03_sfnt_off0001898a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1898A 16792 bytes