Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82376192f3d3035…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 06:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de0e9b455eb1b46f02cbc5a24681d028 SHA-1: f1ea3e7935762ee3235af41b15e8740423b1510e SHA-256: f82376192f3d303567bd0cfd6d4f539d4255d849447fb26532e6249899fe4e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hotelmitrutarija.com/uploaded/files/xulizifarimujinuv.pdf In PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/meledibetokajepisozuluki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80d17ebd---megomugovoju.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210907_CF68FE02504CC529.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/jojeteginituwipubogabarik.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/44985156240.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610b12a740---50576847052.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/jamazikebifut.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cf3eb1b6---11144332406.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/vadudigupujavawifajaw.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/bupexuwu.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/74092944148.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/26688140076.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/fakenejumijudi.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/64424783024.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/36039593776.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/61903866818.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gaxopekisijixuvijijaroj.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/watowidedejowavosedakalu.pdfIn PDF document text
    • https://mollis.rs/files/nokoluv.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/59395542946.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/76485505694.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/ropitamonutowomamilo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/2bnoh9ihtm1gqhbegqtlet6660/rawilojibarimiboxodid.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/sunerovubidedux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=buy+iphone+bdPDF 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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 10320 bytes
SHA-256: d59862324cde622be469aa6e65f63e897d205355da6e2a4ba8f78474591bf8c5
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 17340 bytes
SHA-256: 44cb13f031b4062d3abc83e7c1d94c43a9ba71331bfe18cdab2a30ee7e50b6c8
font_02_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1