Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7c49f10e5a9b9c…

MALICIOUS

PDF

62.3 KB Created: 2021-09-02 06:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a67de1195d162e768649b04145a39311 SHA-1: 54b4dca1ecb280f2a72c0cf6ea6102c99da3a2d9 SHA-256: ef7c49f10e5a9b9c783461630009c95e44f0d4661868960b2e394f24ff64c360
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7090

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=adjective+words+for+place PDF link annotation
    • http://stark-tools.ru/images/uploaded/neduxupanuzekirosodibit.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210731_040508.pdfIn PDF document text
    • http://ellev.fr/upload/files/voropinomobasexofufav.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c9efbeb2f0e---bodumapazexunanujud.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cmb867so61fibfu54cdenk4m8n/38692286122.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/josidi.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/50047400626.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/68647816402.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7af819278d34ccce61d00215d5c1f21d/bavogapiwosexojutuwa.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/dexasisagakob.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fadokititiralifelaj.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/44950221457.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c7e968019---44537963728.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad654537566---51011247105.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/32799761298.pdfIn PDF document text
    • https://jotelek.hu/files/file/3945668160.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/57005167028.pdfIn PDF document text
    • http://ave-france.com/pics/files/refumonipepinamexixajo.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/93634951263.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/4g0hrr6oubk182r6ecsg71uqh7/5606895283.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547b9d2c8a---midusagatulejijes.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/nukasebene.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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