Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bfc8ad3b12b979…

MALICIOUS

PDF

97.4 KB Created: 2021-09-06 07:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab642f6277c18e611da61da73e4d0d1d SHA-1: 8b0152034a90c89ce09724e392c57657142222d9 SHA-256: 39bfc8ad3b12b979cc60dfbd65b819bb6f5c0aa622488a2c54834eb52184e2a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm pointing to other PDFs, with one URL specifically referencing a compromised WordPress upload. The 'Password-protected archive handoff' heuristic suggests the PDF's purpose is to instruct the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://mobilesamara.com/img/files/file/70729757754.pdf In PDF document text
    • http://piotrkowska77.pl/zdjeciafile/72140002284.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/77798487452.pdfIn PDF document text
    • http://baove24h.org/upload/files/75543125210.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29176430102.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/73381240f005af2d03839633752704ba/gopulozadezojunibego.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/30968270063.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210607130025.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/xotebixoforukukodapipedu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a0fd0fc6777596ecc6b33432ad4a7968/94851747678.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/namamosakomudezuwovivodo.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/vizim.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d1e2f039---84139594846.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b241c8f50---15447567245.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4af1e8553bac458fb1f8164e9213253f/64595634750.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b5f3acb4---monalim.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/peladusepedi.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/liguvejuluzegev.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e1cebc5cea3650eb251c5bf10537920e/sitiseboti.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210828_7D24B476FBDD28D0.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c5d21f3e---fufixodatabomulitigadu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b31060ef3c---kerejad.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/pipuluwatusovonex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+reader+scan+to+pdfPDF 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_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 18772 bytes
SHA-256: 5cf656b6370042ff685cebc139d3228cb15b270c6b2b21a2a7567fa05c7c18df
font_01_sfnt_off0001462b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462B 10596 bytes
SHA-256: 3e18da171869c92c4e0576d1afc0ec73a53ed21c5c807bf3389249aa22131d6b
font_02_sfnt_off00015e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.