Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1152b79c5023ab…

MALICIOUS

PDF

94.0 KB Created: 2021-09-19 12:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 353a42daec035b166b5bd45bf406c415 SHA-1: 268f4a9dc8c2e9165bceaf91d3bb123dff117de1 SHA-256: 1b1152b79c5023abdb8843b1a087249718ef1f13da02e1c723a5e23de9825a1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a large number of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://archism.ru/uplcv?utm_term=passion+play+full+movie+123movies PDF link annotation
    • http://teknis.it/userfiles/files/wotela.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/bifiwuxalenojuparogonup.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/1458497922.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/xutowekuziraxekuzo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pfe6qoaqpkk95i8ts6tecadr84/setobojupix.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kiwosur.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/69497670601.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/duwagumuzanijenum.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/406083733.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/81112259444.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/jatifipoti.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/77466265416.pdfIn PDF document text
    • https://matratva.in/userfiles/file/povidinuler.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/jidiwowonozopilonija.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b2b2f72c5c8c32360d1fd031cca0904d/lagadon.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/karutizoj.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907145022_582761472.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/80875779561.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/masusifata.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vadezoxidawujotelatega.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/52696068979.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0876c577---vifafixopobigefo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6354d5687---lubedu.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/86391500390.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/84271627140.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906203114.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea05f58f6f---zifoxodidasudu.pdfIn PDF document text
    • 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_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10944 bytes
SHA-256: a971d7b7851d82a94a17d6c15eda90f2a8c71c2f234241477b4cf0e6d565ac11
font_01_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 19072 bytes
SHA-256: 23be3786812d485fb70024bc9b9a30bb8f2c2bb18b2a8d147ef07dcd5d4f00e3

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