Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebd85426d0b2e01…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 13:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acc449ea8ff7c587f20d697a28d612ca SHA-1: 84fcdf022a80b41aff70d36827546665b2d1d691 SHA-256: 5ebd85426d0b2e01ac9e3e80351e138da7dc00e2194387caf917e44bfb59f043
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or unknown websites, including one hosted on a compromised WordPress upload storage. This suggests the PDF is used to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/53239815508.pdf In PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/dokusikobotisirate.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/89394482738.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/84054174340.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/boboliwubodajuvamiso.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/utida.pdfIn PDF document text
    • http://trieuduong.com/images/Download/72611090575.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/71282359629.pdfIn PDF document text
    • http://mdtrend.hu/files/file/kofaxipitefi.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/25987780859.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021092822535273499.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/69974221221.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rkj7hfcjb40n4cb3vv2gfj3qlu/99793147318.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/kelutix.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd243cd07---ranofi.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/30465167411.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/vewanabobumobezufig.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/gatokuzeresex.pdfIn PDF document text
    • https://tckontrola.hr/files/nuvosonewa.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/11051745709.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/kofifelelarolut.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e2bc543f5---94491772674.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/2846830832.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/6109886225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=signs+you+were+gaslightedPDF 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_off0000b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 10904 bytes
SHA-256: bf3225ea7db0b0f50f35b737be55aea972130d43970696745634652f2ca1d2ff
font_01_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 15580 bytes
SHA-256: 9fc77932cb37db46c00f2d37ba1f423ec8504b527122610f2330356ba782fd19
font_02_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1