Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0876915c0a47ab1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 16:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7497c3b9566545f8c44dfea384bd405 SHA-1: 856c6fcf07ae7039712f3279e9c5837e6ec274da SHA-256: d0876915c0a47ab10d20333e35b2db9b1caebedbbff2280aabbf922938536739
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://basyapiemlak.com/yukleme_klasoru/userfiles/file/xorilikegedexedemuvo.pdf In PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/341313873.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/357150669613a5ac4f0eea.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613627e766503---26262619323.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde5652c7d---8491839932.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/49320730741.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc6eb1ce1---tazewifuzitim.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219131016436404.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/74827113042.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/98806758552.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614467db6e737---wurasaboseposudofudodux.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/guradogejaz.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/94492999713.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/rakaxajulapuzaw.pdfIn PDF document text
    • https://poker-fire.de/file/69705312540.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/faperirevizobenanapoj.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/88709446926.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/bodigarategurukubosimaxa.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/nemevalaji.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/patasubolugelabezozase.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/44554763931.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210911215036_583433966.pdfIn PDF document text
    • http://serting.eu/userfiles/files/46329032749.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/pijubawitadumozipowafaf.pdfIn PDF document text
    • http://ucokampen.com/media/files/wiwikevaj.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/48057880931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pixel+launcher+for+poco+f1PDF 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_off0000c244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 10564 bytes
SHA-256: 6c3666c87fe0627f81a13cf694eb936f356889d70ebb356291e7ed8baefbb42f
font_02_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 18284 bytes
SHA-256: e9f9e4e840464d32e302f2573e4fdc311617e506ac421b53bbd29b26f691d08c

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