Malicious PDF — malware analysis report

Static analysis result for SHA-256 89930f7b27e4605e…

MALICIOUS

PDF

98.6 KB Created: 2021-06-26 02:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 088e28ef15c0c419e3c8973cf9556719 SHA-1: 33e0f515772a50e4c1b9ec58f7e90aac36354aef SHA-256: 89930f7b27e4605e0f07f756f8743b401d49262f0dc04df68325f9339172d9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://wastran.ru/uplcv?utm_term=encyclopedia+of+statistical+sciences+pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee2a5e3a7---rokipazulopi.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6f27bb15---purimejepudebedazolumuxor.pdf
    • http://naturabliskociebie.pl/userfiles/file/fakojajopusurulivupidewo.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/cb7d5b8419a2efe9970233eb6c5964e4/fitevixigabe.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160946845e4973---39793551627.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8f06ad77cc1f09c1fc4a3d0644f38bb/vajebajetesatoziwekeju.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4vea6u2dkktfqas7rbv5p9ngd6/73622773900.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c5daa061---9543283109.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0b38be70---wofazifodisig.pdf
    • https://shibbirs.com/media/files/60701723480.pdf
    • http://fly.no1-yes.com/userfiles/file/kajolupafej.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/gopavenisivojedefexive.pdf
    • http://aliglobshop.com/userfiles/file/sozepanokejivezow.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c15f07f5---76348577710.pdf
    • http://iberia-ex.com/images/blog//file/18124352395.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d2bb359b48e73782f37e39aef9ff6ce7/85418616458.pdf
    • http://eaas-journal.org/survey/userfiles/files/pudetodosa.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160782ec481cfe---kuzivilavivizidapavo.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5722a901---xofizesip.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c084e2e3---65919486423.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6mh1id53t89402pbfvmv4o3562/zoviremejux.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j4k0idp3u4fd2kn62ena186q61/tixufovirugezitibob.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q7dchq8bv2gcm52rjfbkqkqnvl/megegubivapufekebitub.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961092f0e25---44438380422.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_off00011cad.bin
01527f97a3567086f0845f031e13ef14590a733b92df87af275718035ec2b8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 10612 bytes
font_01_sfnt_off0001350b.bin
343b9c1d986b21510af9fd6d7b8b353fece0edd3ee48580afdde095125b2905d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 18420 bytes
font_02_sfnt_off00016505.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16505 16792 bytes

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