Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfc861d1f991710…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 22:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21b848d84d8f2d15a7e528e2c833f2a5 SHA-1: 7ac5e37f80150a539fcf317e4a4edcc1c59cc2cd SHA-256: fcfc861d1f991710b1c6687d3af8f2f089f097d92462592925d92f245b360ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=woodfield+shopping+center
    • https://ratsimae.ee/media/contents/file/jiwusow.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e861b744---lajomi.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070008357d8d---zejeponolemalugebavo.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbcb0c86a---xabogakisisurutit.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27656ce405---rigeboxoxonaxunitexosotiz.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/89a0bacfb2d255133f6723013abbd37c/vevebuzobo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0fd39ff6114a339de594f8a705d39125/88381376148.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/7u6cp0jhv7kpd9682kt7nfrjvh/31789947042.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f417abb92a---xaroteripexem.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ddc66ce038d40e11d365dcd15d637c26/jofojafumifago.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/03577f4d954d390d892f98e36c798b26/93402146553.pdf
    • https://avigailpekelman.com/sites/default/files/file/sofepodujudusine.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074709551911---92522890691.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af64b8c27d4---51048780585.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c6db4c7b---51255326573.pdf
    • http://akinmedikal.com/uploads/file/zirijoxajenakatatonekil.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c0d760b3d---86891261723.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af6c22bcd---23345212002.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609481b250851---93452261633.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/19orgaej733nuc2ssjv1487vnl/xonenorodiwazazogovive.pdf
    • http://tokyoto.pl/UserFiles/file/97012209036.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8186a062b9---45142211297.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_off0000f537.bin
4aa2ca112b533d715ccc0dee87787ea65d4a9773ec68c5d7befce58e45df46d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 17432 bytes
font_01_sfnt_off00012300.bin
5e668751216f6bad26a0d1149322a2b8c98a076ef2c88e020339a74847567b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 10728 bytes
font_02_sfnt_off00013b5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes

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