Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1377701d1be8bd1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-14 15:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c777db6fa74593dfbc80788900fe6e72 SHA-1: b543f51e8bf977e41faae3e01de5115d21d2e7d6 SHA-256: f1377701d1be8bd16682650edf49ca3cc8fda3fb79c2e2384cda1354d8f05f39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc7f4df12---tibejajakudufalakesuvim.pdf In PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/92199678432.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/suzanixajotiwevatimul.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/24220373872.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/94716594499.pdfIn PDF document text
    • http://slovoveri.org/userfiles/ralegukorudogojafaj.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/643519347613d8eed17c57.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0e5a8f31d5713e969d8433eb9e2f09f0/86795001344.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sexowedi.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/zefabadum.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/12905172602.pdfIn PDF document text
    • https://digireg.sk/upload/92474243432.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/miguj.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363403368b4---popatanasofawuvav.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5686de8d5a2b4291018a2c6ff4011717/3439491652.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210911021150_1t36x9.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/patumugumufeta.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/65570113946.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/budotivuvipozoxibaxoje.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/34273387437.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090401011873499.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/mobirodonafinulosid.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/mafodosezevona.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dd036a46---xibuderuzuxigexoniwudam.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071425104589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lame+adult+jokesPDF 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_off0000ba4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4A 10392 bytes
SHA-256: 22fc5d9ba2868297bc73554d29f42abd28d6e270c5c8bd0f085f89e96b902a24
font_01_sfnt_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 16944 bytes
SHA-256: 8229db71204141a8b48ed37aee1786134e351c414fe116ad8df837ea52abdebd