Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7df1769f21105d…

MALICIOUS

PDF

162.4 KB Created: 2021-08-04 21:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51cf37f302fd10329acac0a46767406f SHA-1: a8a10468976de73d96010976a4f7aab53b710e02 SHA-256: ec7df1769f21105db1d351ca5510bfdf7c403f5c561ff147953e82f88c4c19b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9306

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irlanc.ru/uplcv?utm_term=what+is+the+main+ore+of+zinc
    • https://audreyheselmans.com/_files/file/sivatojudufaxix.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73029083912.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2aec8cd73---bifixikitejaji.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df40998b59---26239027449.pdf
    • http://accronline.com/userfiles/file/55818343917.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d9fb8dc11---repag.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a1f9587c---83221216816.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-31/20210531163709144997.pdf
    • https://cowichanmusicfestival.com/userfiles/file/34781283996.pdf
    • http://www.addvanceo.info/userfiles/files/vefiletozitosodewutuwixuk.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83e76e42f6e11ab3dc6d28520faa5ceb/pikefubifigimajetil.pdf
    • http://mikailang.net/userfiles/file/20210501215901_1028750395.pdf
    • http://imi.vc/upload/files/57929117391.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/puhu8lo6pucannvcu67u7hqqmh/26403277846.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76ebb824f---72486978295.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6065613c94---mizimirurokewewaji.pdf
    • https://securitydm.com/slicice/file/58731691468.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1527782203---53682033864.pdf
    • http://jacksonreunion.org/clients/71346/File/51866920317.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086f492ab25c---49246774045.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/493b124d420ab4379f942517884758ba/53611933071.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67aa7ba002---76139625028.pdf
    • https://uniqrelation.com/userfiles/file/45584632916.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b04e4998ad3---30870807126.pdf
    • 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_off00022969.bin
ea7ad5aad2e8b1fa117df3665d4d2375107dc732597f8ae37940274748e8cab0
pdf-font-stream PDF embedded font (sfnt) at offset 0x22969 10608 bytes
font_01_sfnt_off00024190.bin
da2aef17b4141fedd45ccb808cbb094e064f722cb58a521aea508ab5a68b2232
pdf-font-stream PDF embedded font (sfnt) at offset 0x24190 17808 bytes
font_02_sfnt_off00026fbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26FBF 16792 bytes