Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48117ea7ef3421c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 02:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d8f90ce61c7ec3869ee082c267e0e64c SHA-1: 53a87c4060c82389643566f9987f4a26b927c55d SHA-256: c48117ea7ef3421c4ba21a948362a532e10acc239535715095ec4f10f35d32f2
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 are hosted on compromised or disposable domains, suggesting a link farm designed to lure users to external sites. Heuristics indicate these links are often disguised as downloadable files and some point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://crewmak.ru/uplcv?utm_term=mxq+s805+android+5.1+firmware+download PDF link annotation
    • https://csam-villepinte.org/uploads/images/file/70360820827.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/19334372885.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/90492731975.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/papejedakoxolekutisifo.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/86677669612.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/27383178725.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/51958128923.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/90678348201.pdfIn PDF document text
    • http://megalaserasia.com/upload///98601026522.pdfIn PDF document text
    • http://floresdeserrezuela.com/aym_image/files/xokokifutujagojuviw.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6f3d1266d---gaxirakelutobugakiw.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vedelexubonub.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/79082792505.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210922163250.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/93086360542.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/45414959103.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614749221ac49---boludenixeret.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/kabatefezetabegetufazofa.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/21381438130.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e92c5a71ed---vefutolejametuwukemabub.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ea523aa87---8255169424.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/84890214208.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/memidanututanomojezolil.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/fenepewisif.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_off0000b04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04E 16104 bytes
SHA-256: 1c0d718863115d2c95160341b64a7bb25f535e2e4d2da36f1756e458bbefe9aa
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 11328 bytes
SHA-256: 1361c17588bc631cbad1b88c2e562055e4f6d8456851d1501c94ef078d24ab2a
font_02_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1