Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c654a380b408f4…

MALICIOUS

PDF

91.5 KB Created: 2021-07-21 02:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa6644d743874c2104c0ec3f7bf05d15 SHA-1: 506ccaacffffbb4a8f4931d3e45ef57f1ad3920d SHA-256: c1c654a380b408f46438dd619960ec30f5311894092b2fcc2c488b5d4e827d09
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, forming a link farm. These links likely lead to further malicious content or phishing pages. The ML classifier strongly indicates maliciousness, and the presence of random URLs suggests an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a149c8a26---68041548251.pdf In PDF document text
    • http://samtle.net/ckupload/files/raxabenefenujimodonixilu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/34376847523.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/kepukivobiposoduribo.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/wipegugenupa.pdfIn PDF document text
    • http://citranco.com/users/files/11166866153.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d8b14fcbf8b6411bb2f215c9cf94292f/zelinak.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210721_062216.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/89882468174.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/2583698499.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/kobodapodesorela.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bd42e1888d8b69ad2ab95b6ba5d595ba/gezawaxitelafif.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/46612157869.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/46636068019.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/54655392689.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/38730541939.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca96cd9441---24862647338.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716d150ac50---25963165685.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/dugolonaxarusexazifazome.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/mopimobusebirijiziboz.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/ramewitajomemiwekakude.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/66f0840eca39a48454adb28b924e6aa4/bopotomumenurukugi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160783bd5c41f0---90362914406.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26cb9a7670---wuketusorazafiwozibisoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=standard+test+method+for+pulse+velocity+through+concretePDF 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_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 18544 bytes
SHA-256: ecbbd3d63ff4ca719d17df54440865cc9d9197e50b93b73acf53938de7166a26
font_01_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DF 11424 bytes
SHA-256: a3b67bac0c9433964ea3e7c9efcfa0ecfb08512422073efc04c39acf6a9c41c2

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