Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a25dc42a361a0c…

MALICIOUS

PDF

104.9 KB Created: 2021-08-06 18:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ae23cec15f8bbcffb100b60268d1e97 SHA-1: 219fbe90c091817a05ca503f3f273cb9698c9848 SHA-256: c3a25dc42a361a0cecaf1c3ef2d227934f4ccf807877635f60907a96b4bced25
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the presence of numerous external links, including those on compromised CMS uploads, suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ef1e23ad8df3aaaa9aff7fa496c18c8e/56707053229.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079817321---73604111152.pdf
    • http://thumpamonpally.com/userfiles/file/26988639917.pdf
    • http://peneleos.pl/userfiles/file/dekut.pdf
    • http://dharmapremipariwar.org/userfiles/file/9387738466.pdf
    • http://matsusushionline.com/uploads/files/82195713579.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/abd77896d10a5cd955e189939488c07d/zutaloruvuwilaxodu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610017a7bce18---buwewamoge.pdf
    • http://owv-sad.de/userfiles/files/69401808294.pdf
    • https://btcauction.vn/hinhanh/file/92827124671.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/54f1a66d0adb26e765143b997fa5b90b/kamutotetiganu.pdf
    • http://abwjefferson.com/uploads/files/21691524653.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc1ce7eb0.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/53612776445.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081954bd6052---27472711245.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/lameguwozese.pdf
    • https://nisahanpin.com/calisma2/files/uploads/48097821994.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740319aabd5---tozatojotawuronubem.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ebcca6d8462c895b8a96b07d5d241675/15924407742.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab8ca4e5eb---65528910663.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ec9a5adfa---83499279485.pdf
    • http://alnoorcity.com/userfiles/file/73351312567.pdf
    • http://ibb-online.ru/f/file/fugewejezamidofogezux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=la+divina+comedia+el+infierno+resumen+corto
    • 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_off0001363f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 16792 bytes
font_01_sfnt_off00014e51.bin
77c815440cb52975d6185548ba778e1f05976ab7a73d394e7fc419a20dc4be29
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E51 18316 bytes
font_02_sfnt_off00017c6d.bin
6d821d7c3994a007fd091e41720a46d1fa718f370c611f263df767928f356491
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6D 10760 bytes