Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa119ec180deba60…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 08:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fc5738d6d3c45c5407acbbf411f2582b SHA-1: 7e77c64c1f515cc4ad22f2a6f4cb2dd0fc510c3b SHA-256: fa119ec180deba60318ef1166920634ee315dfea7e04aac1449a5306736c2020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=call+me+by+your+name+full+book+pdf PDF link annotation
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4ea095f5---bofumepobexegulazulozi.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/mitinekodaw.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/26510963853.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135af1d348d2---wepomifatitujixakovuwod.pdfIn PDF document text
    • http://pedraferro.com/files/files/papekufiwilu.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/jubikopejinoluzu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xovevitumadutisogoduv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c85dd09942---6047207986.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/77986163561.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888702bc92---pasurewisupamenozin.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/30087013457.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/45308344428.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/91269649798.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vimilasipubu.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/totuxewowuxute.pdfIn PDF document text
    • http://tianfonmm.com/d/files/17450783736.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/53351707.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/kupezuvikagivufokuso.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/gajusopolife.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/zidutotupi.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/zafarujoxojapotitojok.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zezuxuwujaxored.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_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 17384 bytes
SHA-256: e5b60137416398fafbc7a31f7db2b500269fd4ccfebb9a878ef643cbd5edd24f
font_02_sfnt_off000132d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D2 10776 bytes
SHA-256: b4cb398a21ce591daae48d6913f2a49cc70cd2d0f53c99ded83f921cbdaadfd2