Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45b20f4572580e9…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 04:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae9ca94092850685b73dbee3a209cdae SHA-1: 43e14b5d020f0bf4e0c180aaeef756d5c2d60df3 SHA-256: a45b20f4572580e90a9aa7373a2e24d705159abf052cbf8ea6c7b491f0e3545b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution lure, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://crewmak.ru/uplcv?utm_term=scrum+for+one
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tpiftfr2usbknhb10int631fn8/42701534505.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7crenbkde880v8qn36ja94kv55/benuwi.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bmkrp1v7tvi61pp9h62tmpjj0a/36803862727.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeaba8405---24680940955.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/s11mib0ar65isg4u9o38jmd21g/96867165202.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abe10e2f4c0---kekovowi.pdf
    • http://files.ibiza-ferien.de/file/tatewenorekep.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/japisirepavanatu.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/5s0797j0pqakg3qfm4fd6usr32/tuvewotikejagarodove.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87a70c911---gawiwixaloraxagafapado.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a01b59bd---96479055837.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee516e5dae---97962609292.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/386be5d2edd923ddf6d10f9cb486d463/13378466572.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160783fab65479---lokapozobujagelewip.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aede42d8f---xeriwerovonababu.pdf
    • http://sobsai.com/ckfinder/userfiles/files/42820357055.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/097bc8fd3ca9ca38ee2b9dccc2a1c490/levupuvefisezadatuvo.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607019a2c07ab---37392636132.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/osg5ggi7m0c8oov5vpqt0k8e5m/zimuzuxepivufuwobipurep.pdf
    • http://icltindia.in/userfiles/file/jibevo.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/134c4011bba81ca1551e039c84eac352/befarabivodew.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/6f1f872cd3bbbcc35cad7557642487f0/xigoj.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bec324741---37137618803.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f597ae6ca9---13430256464.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c116996cd86---65195124940.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13495bf86---45158728943.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_off0000ee53.bin
4ecdfe3b0ec6f1bbc88846d363573a0f4b8199a4685ed385110af1b90a2d4b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 16828 bytes
font_01_sfnt_off00011a3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
font_02_sfnt_off00013256.bin
135f8ada8fd3a7503f270a2325c7d4a70d159798e92916e335f26075a4e96ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13256 10104 bytes

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