Malicious PDF — malware analysis report

Static analysis result for SHA-256 860c8cef1e271db3…

MALICIOUS

PDF

123.1 KB Created: 2021-07-24 00:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e5089b78a2eb58ed4990d206e5245c7a SHA-1: cd14668abda63bac63b7dacea944aeeea50a7946 SHA-256: 860c8cef1e271db3ee4d3f3aeea40b234ee58b2c1a40bb556a8852539665dc54
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c8cf2f40---lawokekeguluvesuxuxevazi.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defd4c69cea---7643588191.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa0977c90d---25144875886.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d86f9bb3b---15664319776.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/71223705563.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/sitadorujuxavuvadotufa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/s5k8hj2ef6cjhnh0k55urj3b4e/wisakasike.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kisoniwebubu.pdfIn PDF document text
    • http://boldogelet.hu/media/68168315159.pdfIn PDF document text
    • https://renault-service.com/userfiles/8527575047.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160920a33c680b---napivami.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/suwufogonasunezozotapizo.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605102503.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/9bca7bd73b57cb4e1d23bc8f61c306ba/64716553118.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3mh5444s193p91gahlacveb597/susepimosotofedewalolugi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k1efh69p8nd0egc532kdolk3po/midimifarazafabem.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/raretakokanupitodojupapo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39c9138e08---gokuge.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c504ec67---38205832134.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/tigunatosexu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea7dc8a66---faxezekuwajubav.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a44987337e8---kipoxobiri.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/dozupuzexorun.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/17654416643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+absolutely+true+diary+of+a+part-time+indian+chapter+16PDF 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_off00017d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D51 11456 bytes
SHA-256: ef351ba876db497a792d3eec334bd06acb394b4a3aca12bb58a13268789f459d
font_01_sfnt_off0001981b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1981B 17036 bytes
SHA-256: 0c61d2cb6eabff6fb001a577dc9447fa4a21f3c6391a3dd2d0192e545db31827
font_02_sfnt_off0001c4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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