Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb84759fe176c9b5…

MALICIOUS

PDF

82.6 KB Created: 2021-08-24 07:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f1dca402593305b4caabe432de9e182 SHA-1: 7e7fb6b31f40f9470eeaa2b200fe0e78bf753a81 SHA-256: eb84759fe176c9b5f73ed1b06963ddc58cce3aab2204bef23d856abdd2abbe2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a link farm and the nature of the URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b14c87998a5be52904ab3dde710a6164/kugujeposapaseredenofaku.pdf In PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/wejosaka.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sefukabazegapifed.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/pawaxawidiwo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608716b31bfb1---22279062452.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021050765252_588903045.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/totevipidajoteruxi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c679c4863---kemuse.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/65024609944.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/vimunawuxawatef.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/83164261039.pdfIn PDF document text
    • http://termocity.by/pics/files/mesufakumubefomonorowur.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/gajufakinirobesejanekezuf.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/pilixijazogewipitagubobof.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/gasigutigoruzixugegurer.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c7c6f52d---tumodifowevoj.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/53212770545.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/jidigunogenelosabirufigi.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/nulovuw.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105183838da1---pidebiguruvenunuberareja.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/susujekav.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6b85496ca21ef4fe90c22adee9b84350/14022185865.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/90e140e4243e6af09e5d36deb2636b7c/dabovudikiwagufukodujag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lords+mobile+unlimited+gems+apk+downloadPDF 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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 11112 bytes
SHA-256: 6ad89f87f0663ea1334defd9b4c439e7462dd7dd7f99d164e412a8a597fd503d
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 17048 bytes
SHA-256: efd2d7194a8aef8912e484aca7df38cc78b529465876c8784f279c8248b8a9c4
font_02_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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