Malicious PDF — malware analysis report

Static analysis result for SHA-256 2776e3554bebc521…

MALICIOUS

PDF

83.2 KB Created: 2021-08-19 23:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f485e53fdea79633550133ab0e684cf0 SHA-1: 1848db185f0312f428b3b08de7f917fb010597db SHA-256: 2776e3554bebc521857cdf16ad5f6926c837b07fde946a3d809fdf02ec4eefc5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites or disposable domains. These links are likely intended to lead users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • 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://chcial.ru/uplcv?utm_term=jurassic+park+builder+mod+apk+updated PDF link annotation
    • https://free-spirit-city.eu/uploads/wysiwyg/files/75367254115.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/jawagezijiziwaguviw.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/46017576056.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210704_045E6A451A9871F8.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/68f6c1d1c1c837916077b715121f9845/6569049705.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cc2332d---parogavigonuliloxaj.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1e6a56c4---21011620581.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/nuzil.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ba2a2cca46d11ff56cef46218aa8ed3/dawaraw.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/efa582d4efcb4b0ac93f61ae8d8accbc/jozezaropewegofev.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/zamogamaburetutawu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/bojedugoveranolujukafew.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/51687407471.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff31df5f2---worosedebikekagotuxitiwap.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hsb1c00qsc4qlb6nvs3kjls3t2/tazixinapifimemodo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/94f286542882e693198c1dd933c76719/3967250197.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/44054543822.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42e0c81518---visuxifanovijobakejopapib.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1585cda785---43122305414.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/84811495532.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e9d774cf205d8e73bdf00f1ed83512bb/pimupumawakos.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/89269884182.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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 21524 bytes
SHA-256: a2f6132d11a6d7e7c6e94dc0670ebfc49f0e2c85e7969295cc527757e1c6f698
font_01_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 10896 bytes
SHA-256: 02e65632e5e2dc4f6b1c5a76dbfa3f88ff84897e1a30a742e383b548f553df41
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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