Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9cf72b13b69103…

MALICIOUS

PDF

98.2 KB Created: 2021-07-03 21:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87591d0ad0c99745a3755acd018c474b SHA-1: 2fd9fe187a212e8044479d55fd775c489eb3d7b0 SHA-256: 8f9cf72b13b691032c3331aab18401e0dc8547a88fe3c144262fe83984467e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/19400efbad4971471f410d6e8d579e55/55081099416.pdf In PDF document text
    • http://i-daa-wl.de/userfiles/rogubekorenijuwazajo.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/78781915422.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4c7c7ae3b210b9380b3c6392a60ee07e/visexo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2mn079knf5nrd2vo2iakusjn7i/nifokebatotevomo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5205cbd24---daboduloduxo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/88326268011.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/l54g3dc8em8dfdn903gc6pm88c/rovareneditojozogi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609984ad1d798---40987453280.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/gesafinize.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609def530228e---wolasemakomefefazigud.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0ecb38089312ece9fc69f3e68ab2b618/73018168515.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/23352103074.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/29967443826.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c62d33312---janotogut.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9ddaf157---69138117834.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7bgnkobgehsor5srfevhk29936/62236587343.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/tisowazaselipenovefewino.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6k52rbk353epvttggn24m0qbr9/tukovelijukitavapuminovi.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/97732452536.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a529c7e6cd5---xufeligaxotebafimisu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6a3cabdb8270f3cc342cf38d428d1713/29284337256.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4n7u7ch2lfjir2l19agv9cqt86/1467627508.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0128279e0e---26547643622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=female+activists+todayPDF 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_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10484 bytes
SHA-256: 374d630447115d1e6cba6299724d612bdf44e68fd6f02913c3ca6a991d2ede9e
font_01_sfnt_off00013302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 18500 bytes
SHA-256: fb577cf98095132a00866f48889b2635f99aec984abb538830cf612e0cfcff25
font_02_sfnt_off000163d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1