Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb112204427cbf8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 02:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71b9406202cbfc8bf1c765cada3b2c98 SHA-1: d9e82c6d58a3d1d7036e2023d94f024b07bd570e SHA-256: 7fb112204427cbf8574076c3c7fa2fda3afe2c3ab8ff3beba862d15858960cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many links pointing to potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many of which are associated with link farms and potentially malicious content, supports the conclusion that this document is designed to redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5106

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://gpe-el.pro/ckfinder/userfiles/files/62435208432.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/akabujulagokofovorokevi.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/12619378001.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/17008731538.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/24365200292.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/40673170788.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/56999495057.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/mewufumusemupebegaxonu.pdfIn PDF document text
    • http://mimpiindah168.com/contents/files/duwibe.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/42771032429.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/88104571210.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/turipa.pdfIn PDF document text
    • https://topupdana.com/contents/files/58998893140.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/13590211330.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/99051480849.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/57491665990.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5e0b6da6b6dfb252fc1f0d8d22fa3f71/34753263070.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/85944358868.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e7fee1853fce821061b645255274cee1/zuvojujaxevobir.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93655708659.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/vopojizokugidadavi.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/75780283041.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/61515348612.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d246895d94---47445866528.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/77940408708.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/dabawuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=coffee+break+french+season+1+pdfPDF link annotation
    • 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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 10796 bytes
SHA-256: b05a28ccefaa695733d1e88eb6e3b4e591a6c1b2861feeaa3862b5d914974d93
font_02_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 19148 bytes
SHA-256: b1826133c20a5b018b12d397aa213b59cb804ba080a5de456722e025ea767a35