Malicious PDF — malware analysis report

Static analysis result for SHA-256 7323fdbfaef757cc…

MALICIOUS

PDF

82.8 KB Created: 2021-07-16 01:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61c7d0b615187db02d314bb2e15c169a SHA-1: 8d0b02fb7af50612cf56b617f93a7bdc8802ae98 SHA-256: 7323fdbfaef757ccb900d29604f2e31c785f6ec44b1c029e43fb92c1b804aa04
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608469cd61241---wizer.pdf
    • https://martabaktelor.com/contents//files/19278379032.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7947e125e---86764070041.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ad6ba24ef1553374a0bd392d6dcb5f06/3516732647.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a646eb6f226315ad22c812860f35e6e7/lupage.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kexapaxora.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/44e50caf71055edfeaa7254c39a0e92a/demuvibikotolo.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3i5mnuq3gg2ndgfqub8g7nc5uj/nititogigevetaxixa.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0088b38bab143eeadde1e950a5d7ecf6/50163236178.pdf
    • http://allnatureint.com/userfiles/file/ganexanotiditobab.pdf
    • http://chono.mn/uploads/userfiles/files/78082073477.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/47210360250.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c82bb11a---73594601477.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5e1cc7b62274ad00cc9ebf6fa76ca3f4/putanobibemuzakomupivozo.pdf
    • https://yingzhaoliuart.com/upload/file/88550502921.pdf
    • https://fwullong.com/upfiles/editor/files/wowizigeziwigirun.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c56f9a49fd4---34494447334.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/ludoxuke.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/kijifuzonusi.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d66ba3ec---19138069224.pdf
    • http://anvlaw.com/userfiles/file/68506801720.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af89b88f95a---jodegaxisabizikopijuk.pdf
    • http://calisnt.com/uploads/files/pexosowozejoritobirer.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/6fdah252m7mbka0dgahj5njd6q/gatorodidataxoro.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9vd1fsf1le8f86t0eupa7u84du/voraxulubemu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=are+all+stocks+down+right+now
    • 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_off0000dee6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16792 bytes
font_01_sfnt_off0000f6f8.bin
6adb3f4469322d56a3f7eb900e7cbcfaa39e61676e280179a415cb7903087c61
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 17580 bytes
font_02_sfnt_off00012536.bin
ab5fe3673530229afda71fd85707a2f0f5accebf1074e9784bdd450474bd66fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 10808 bytes