Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc28943cba19d566…

MALICIOUS

PDF

91.4 KB Created: 2021-07-05 04:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 956c662b1418c07b0863ab915e17e0f5 SHA-1: ff3b0d9e1ad4c79c54a8b3a921046a296149a34d SHA-256: fc28943cba19d566b472e47c0d0a44e26ec3d4b0a8c77d536d3aa1d10b2234ca
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness, identifying the document as a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://weingut-suppan.at/files/91446764363.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a0b9c3311cf3446486fb6b59f0923f62/60539168089.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d7a4221e---popoli.pdf
    • http://fitviewer.biz/files/file/razifi.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/243dc39ccf58c8d825c67a85650a1cf4/tuxivinigowofuvani.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b715e2421c0---gamozipemabosagilakop.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/nui406cso3rmbr9dvvnfe715g2/37272271744.pdf
    • http://robertoantoniz.com/resources/original/file/97140187783.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/okhsk92mggqhfh50dl5fnhg903/parigativopoj.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f052c74a54---wijij.pdf
    • http://veivel.com/userfiles/file/58755262076.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082c409ba7---xobivaloditataw.pdf
    • http://archi1919.com/smlclub-files/file/kixakekulow.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096c357da121---61421413329.pdf
    • http://loveperfectionschool.com/upload/file/31245771582.pdf
    • http://dyglas.com/userData/board/file/75766821947.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9a6c280e2---ropiwijusejitukigamawa.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d587a9882f---xobujokawip.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5053bb82---2811581741.pdf
    • http://1utilaje.ro/mm/file/vunewotovofaladuguw.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738a346cef7---88740897868.pdf
    • http://niszczeniewaw.pl/userfiles/file/dubotikudebumi.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4c97e35f---vetefedokivina.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=left+side+ataxia
    • 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_off00010433.bin
29681f25915fe7b0037e6040ae5cf178045358f22ec1b8ca67a91e549359d923
pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 17156 bytes
font_01_sfnt_off000130b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 16792 bytes
font_02_sfnt_off000148ce.bin
e927897885992de30e5f7a95c2cce801243c4d75e0c4dd0b2f38c78d49fdcec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x148CE 10036 bytes