Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4499e5ee6d62681…

MALICIOUS

PDF

81.6 KB Created: 2021-08-09 04:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2fdffd6890971d7d032fe99af87db33 SHA-1: af3b79066ded9f930c937b7d6933488a414c62f2 SHA-256: e4499e5ee6d626810c5035048714eb1feb6f5b2c8538796c7440a7257916eddc
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS upload storage. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://akapacha.com/userfiles/file/93456277559.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/86114450578.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/aba1f04fdab90043564d37d2fca80898/govimavapitolakaridafi.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/begewebeko.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95f8705c4e---55204768834.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/08/file/20210808_005733_156.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/61041766832.pdfIn PDF document text
    • https://termofriz.rs//files/boxefuwijejosujoxeripax.pdfIn PDF document text
    • http://houselandia.ru/files/72815957411.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/niwitafabiputak.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/golareladovozupoken.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rker2e8v1mbv48qerglk50o355/89477920151.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/76291937998.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jorodijeturisebuwomuteje.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/xonexuzevuposajoxepedeta.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vatutigibevarus.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b9409a43a---wipavutapesefulawekow.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/63050698125.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/53552173301.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kivixusosefisegejabemawim.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6933810b---28385639412.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/xomozudenenesuxekes.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29b6bba67---93994813600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=psiphon+pro+apk+download+iosPDF 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 17316 bytes
SHA-256: 3b3ffeab841ac98f9fa351eeda3b10281ca6747bd191f4743d38caacfaecf4d8
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 10436 bytes
SHA-256: fee7190ebc3e0ffbbfb3e0bd98739e7f5876837582982f385ddc2bec2979fc86