Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88f86fe4acd45ed…

MALICIOUS

PDF

182.7 KB Created: 2021-07-01 17:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad5336addfa077d20ba3dea3d350364a SHA-1: 1c2c1dc8970388b17b80d4fb0c8d996da11c805f SHA-256: b88f86fe4acd45ed4448bcac7243ed40e307a7afa55074ea6d2e16f2b3e056ca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/mefiligekatabebusefetifaz.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb07930c4---62257917208.pdf
    • http://banghetretruc.com/media/ftp/file/bupavenageneminiwatif.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1582bbb9c---fifeja.pdf
    • https://m-isc.com/userfiles/file/mapiligilefedeluwa.pdf
    • http://ownlines.com/upfiles/file/70514090600.pdf
    • http://beiwendq.com//data/attachment/file/94172195023.pdf
    • https://bhsbeacon.com/FCKeditor/file/16979977247.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dd28d834dfdabe0bdfb6df9f4ce486aa/1127368649.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e36c475e465114d1a17100cb5bbd4418/55145858757.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5e065745---97999004361.pdf
    • http://fashioneducation.ru/userfiles/file/86292571905.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/97u7dpe2opjia8bofg71cqt5ps/48298286278.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/67028cd059e3e144c0743ca3d1783d17/zumiwagesudow.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160befda6b7ab7---52712808006.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe621d16cb---64514032710.pdf
    • http://195exim.com/datas/files/1594452408.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/rg67ged40k0kl1mpdm88ikkit5/99716947998.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86cac0b71---87080440412.pdf
    • http://polloricowings.com/uploads/files/zunojepipatusiziwaku.pdf
    • https://maintogelonline.info/contents//files/95870030283.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210621015009.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unity+in+art+examples
    • 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_off00026c5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26C5E 16792 bytes
font_01_sfnt_off00028475.bin
6d6b0e1ed778ffdc603aa9165e70444dffa4aec23fe6c14db63da0e4e3b50a9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x28475 10516 bytes
font_02_sfnt_off00029c62.bin
09acda4774f9a2d66cf21964f741e8c4714cc278716cf099fcee3b969f19a4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x29C62 19464 bytes