Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf89c5f725ee3b24…

MALICIOUS

PDF

85.8 KB Created: 2021-07-15 11:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acb3650ae342ae2f6a0575670468fa23 SHA-1: 56d125ce31fb004aad0d2094746eeb3ae17774e1 SHA-256: cf89c5f725ee3b24e98b32c563dc629818050390de7a082e00ca7e18126ea8e4
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to or download from these malicious URLs, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/xabewamojos.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722d5234e88---voxigudujidu.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/vj2emc69fe5gfjdrq3e2dronf3/88088283427.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4085fec4cedc8600bff753b61981cf34/dazedudo.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c339bf9871f---30052298853.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/84595927197.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7f258bb2c948db4d9af57ed4dc2f6515/75565539440.pdf
    • http://wsystem.sk/userfiles/files/1966399153.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5df2b384---55791861383.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89b24a515---nudisodalafebajimoxase.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8498c28a5a22138dbc64b0ad867b6014/gobovotanadem.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8105a92d9ad6920b394e1c75303f3c0c/99619795157.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9cfbedb9a---zizozevevipazuvaku.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/musiwedobusod.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/e9oams0npjuc8ueaapgsst69l4/bokoguwod.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/46143336593.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8742f8a27f4ceca2e9ff5ddab029fdfb/winekefijobor.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/913deaa91e60b7cb6ecfea7a6dcfee6e/86164026468.pdf
    • http://elisa5888.com/shopadmin/upload/files/zarubewapitusi.pdf
    • http://kochamsushi.pl/UserFiles/file/refexonozuvowijiduwe.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80af59c9e---keses.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbd598da5---bukugelafepagiw.pdf
    • https://allcreaturesinc.com/files/files/kolikezunakazapiludumoka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=september+song+lyrics+earth+wind+and+fire
    • 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_off0000e99f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16792 bytes
font_01_sfnt_off000101b6.bin
5b6f2ee9ab1f74b338028418b4ae8e285de2eda41c1ea5817325123cf9ae6864
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 11484 bytes
font_02_sfnt_off00011c48.bin
3f205606e68a45fa9cedf6cbf2dba0febe1708a7dc22b9b93f7b78bc0b93c101
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 17308 bytes