Malicious PDF — malware analysis report

Static analysis result for SHA-256 723f23c033ac6b34…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 11:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc7a36e5a4c098c7b9d7b5a011adfd8b SHA-1: b55a0365f305e4ebf992723f09e2f07c22783a2b SHA-256: 723f23c033ac6b34a7c9a72f2be86b9a6289c81eeea0c23af7352d5803569764
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links are likely intended to manipulate search engine rankings or serve as a distribution point for further malicious activity. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pf6mqaobejls2qj45r0861iv8d/1260835023.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd166eb513---sorigun.pdfIn PDF document text
    • http://zuche0551.com/upload/file/23878928006.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/xevovamuda.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g0phof627ejve46qoki3g22d24/vonaxajaw.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/j1h4t1a1s8kqa3qpteu4q7icfn/96389957748.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c40cf591---kitomodizetagotebemakusul.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/nikewo.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/76766866549.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7f6dd17244bf8eaa5c0b86a41a4cdf2c/98042454934.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/60072322653.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/51975465732.pdfIn PDF document text
    • http://innotack.com/userfiles/files/25549851950.pdfIn PDF document text
    • http://learningkey.org/userfiles/95531489257.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/rodugarapevotogagenude.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d528355ce2---63223764221.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/25jfukr7ics9h4ak28g08pm3c0/govovowonaxawobuzolufibo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e157d072a---jigufojogafew.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7ee0fc21---9908026658.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tnh63hpkt4kuhrntehcs70723k/fuzodavovam.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/83416483f91366ee2c9b6dfac8a1f781/bezasabubuvuroreriket.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/bf20951ff7e5718cfd5581910b787e23/sedilasutorir.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/dupew.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5386e88da---76575462690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=equivalent+circuit+of+three+phase+induction+motorPDF 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_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 11180 bytes
SHA-256: 7698a63e207021ff700f7fc73192b34f168d395474228543a5061cfc3ecfe789
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 19924 bytes
SHA-256: d7d5a31735419d01495ec54d53d6c22da87a129f3db54173eb0b943953732a95