Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2e610b4956acbb…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 12:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03f3674a58c1283e8732c9d5c79845ec SHA-1: 0073017606e02b2b9640629b79bbc9c3e90d02f8 SHA-256: 3a2e610b4956acbbd1e069fc2c73e079a5cc900d7b5df68330070fb7a9c1521b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on compromised CMS uploads and disposable hosting. The presence of embedded JavaScript, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to lure users to external sites. The primary goal appears to be redirecting users through a series of links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://cructi.ru/uplcv?utm_term=seven+deadly+sins+streaming+online
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbec2e4a1---54376511946.pdf
    • http://gesundezellen.de/neu/userfiles/file/pamugoruwaroperuba.pdf
    • http://gancza.pl/userfiles/file/vuxazo.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/42f209b30f9d57ba3e5226bb939d93a6/patub.pdf
    • http://citysuji.com/ckfinder/userfiles/files/45905739741.pdf
    • http://kleinschaden.expert/userfiles/file/ketafadixefimu.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0f248f53264f2bb688ae34c8d526c9ff/semibufotiripiwonavomi.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b555792618b---wuzox.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003a7863aa---49549243324.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcdd7f129---ravusanopijemuzevi.pdf
    • http://crmrealty360degree.in/userfiles/file/8395232698.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/mdcbibnlp9p5fqhauimsv52n4o/79892353955.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4v882d1qv0i5k0k4r1u4vt4si3/fedej.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hh4sm1vrdmcopt8pp7c9jjjiu2/90424566086.pdf
    • http://drivescuolaguida.it/userfiles/files/74911586479.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/52a0p83d835gt96chicpviabiu/kobezakepexaki.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8cde9aee---pirokilesitizod.pdf
    • http://indecomavo.pl/inc/xerajupuguboxa.pdf
    • http://artospace.com/pics/file/tirim.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/799b59f315e83eb7f0290eca05e47df8/kopukine.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e985992b3115a54c3cda252f23e63e70/wipejelefalajefexubun.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n575o0s7597lsq1vmb58ps85rt/dumiretubeluvukoviv.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/85952172240.pdf
    • http://tizianaiberti.it/userfiles/files/59864330490.pdf
    • 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_off00010048.bin
158027520c44214d9aa9a5094910a553ad010aacaaea92025c967ad269c3d942
pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 10844 bytes
font_01_sfnt_off00011926.bin
e38384611597905f9492b6e7a27df3dc6a1ba65095c9d42a7715763456b93526
pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 17892 bytes
font_02_sfnt_off00014852.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14852 16792 bytes