Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7a71dcfc461c6c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 05:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62e90f82e20c97c0ddc23474625d7570 SHA-1: 0f1a83d8b28fc74c63ffe6c23e55d0b1a72ede28 SHA-256: fc7a71dcfc461c6c418b1b6b644a31dead212b3b5a9c5a4312a5c1aabab81245
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to compromised CMS upload directories, specifically WordPress sites. These links are structured as a link farm, with many distinct hosts and a low number of links per host, suggesting an attempt to obscure the malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to distribute further malware or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100dae427a40---tovexemagovoreb.pdf In PDF document text
    • https://srilangkapools.com/contents//files/wiziz.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/b51avm1nq253an1d4h7ncf73s1/bitenasozabuzadut.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/75537085244.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/80332562150.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mutuzakuwi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f0e827693d22a4d719a06dccf8ee0ed4/31496177637.pdfIn PDF document text
    • https://parfumzone.ro/files/file/30405045955.pdfIn PDF document text
    • https://renetravel.ro/images/files/vedejaliwizo.pdfIn PDF document text
    • http://djapm.com/userfiles/file/xokofurok.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074259caba5a---97497276762.pdfIn PDF document text
    • http://mosjob.ru/images/file/80721217001.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b37c403e---17923060611.pdfPDF link annotation
    • http://watch62.ru/files/files/47376027290.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92408226ed---79195351551.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410bf73615---30696142173.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/16215820574.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608715073937f---bowamumumesizixevozafu.pdfIn PDF document text
    • http://ahchala.com/img/file/43086285524.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf0fe82170---josuxe.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad7629615---kixivuxudiverolafurixin.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/33482726422.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612889c20d767---bumanok.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/nuparadigixiwexozumodez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pain+under+chin+and+neckPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 16124 bytes
SHA-256: b1c1fd50924b75d125fbdb25958b3235243ea4ff0794ebd07e9a249ec42a5e99
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10228 bytes
SHA-256: 3673422a2b242ad62569227e1bf9d3eb03d39cf5dbd7ecbda78dd8659bc57045
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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