Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60a9aaa005dfb48…

MALICIOUS

PDF

74.2 KB Created: 2021-06-26 16:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07cf9c3f292b8818fc0808ef3f687304 SHA-1: 5979284359b2e9c903756f1d3eae676ba820b3b7 SHA-256: c60a9aaa005dfb489547dd93ea765954c0b85f2f9a90f37b97970370ac6db20e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bestapp4u.com/admin/uploadedfiles/file/24890827794.pdf
    • http://highendschmiede.de/highendfiles/file/meguzasiniz.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/40692824239.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/89a031f68fc86306f207e3cbe89debef/fepetapopidezu.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a34cdf6aa---36346010419.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/gutajajubujixeketatovasa.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f66f9015a4bfaf11adb2606c754ceae2/74118925201.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69bf7e1573---50390536586.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e8e40010---42036273843.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/51c440e834424e1a74a7f62aaa3f2fe2/587792801.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/91131447012b155b5bf42ce95f857cf8/40300970670.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079091ddc663---5981571520.pdf
    • https://abofahed.com/userfiles/file/lifukowuwijemiburu.pdf
    • http://cdkkck.com/uploadfile/file/20210607044650.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72a967fef---xokasewatosan.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac4ec876c---9599458352.pdf
    • http://soles2walk.cz/data/file/69607087817.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41242605304.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/18e51e2c05a7e1df8340db19cb31cbcb/sazatedu.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/gizofosumiziwo.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792eee4c5e---86694134855.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7ad76e78---71828257174.pdf
    • http://adamlegal.com/userfiles/file/13188017062.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=slope+run+game+online
    • 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_off0000bf59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 16792 bytes
font_01_sfnt_off0000d76b.bin
d4686772fab9c8aab7112ad55f7267e2fe381b88cd1b7c59d7466b860d2c0150
pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16592 bytes
font_02_sfnt_off00010252.bin
93fecf86df1dae4955bad5349b367e02fb42a728b6d072f54308eb13c1facff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 10504 bytes