Malicious PDF — malware analysis report

Static analysis result for SHA-256 e781411380240fda…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 21:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0c891ece7ebd140d1b332dfb0ccf469 SHA-1: 02f5cbdbb44d07becb2bc9193abc00223fe6e63b SHA-256: e781411380240fda6ac01f17156f984e37d518eedc813f9968c42560ddfc339d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing or malware download pages. The presence of external URIs and link farm heuristics strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=adobe+photoshop+7+shortcut+keys+pdf+free+download PDF link annotation
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d23270e27abbb2b4b6e55a7820344ff8/38348186413.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eeab5fe90---21582775236.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/modolaxosufo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/gufajoturamiwikenatiz.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea95b62b7---timakazadowokozaxajesufa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87d67706c---95061773664.pdfIn PDF document text
    • http://thaide.org/userfiles/file/nipebepaxaxu.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/sekefovapokobafedasegabob.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e1bbedf91bebc05402f0e170f111b79f/27681226995.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/loririruj.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/zamuko.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/55204264251.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/49135149311.pdfIn PDF document text
    • https://tonitomov.com/picture/file/74399030905.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/77844468786.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dumelobizilobolotokure.pdfIn PDF document text
    • https://digiconelectronics.com/media/14419186945.pdfIn PDF document text
    • http://186086.com/upload/files/7340478955.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/fewatiwi.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/jemawujon.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a2b1b63241.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/57931734813.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/1904997147.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78e789e06---36966950274.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_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 17052 bytes
SHA-256: 8f80f0922c0a8bf51582beeccb9cb8fff4f2d4d12b1bcedd343da18fc3bdfb37
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 11188 bytes
SHA-256: 25a2d66fa621cc32bd2e67e0988e198d56a3c6938a1443981ea0bbade47cbffe
font_02_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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