Malicious PDF — malware analysis report

Static analysis result for SHA-256 1124989beafa50a6…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 21:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff019228e38b72f5a84f0900a8df9ad6 SHA-1: f6caf2defa65d70d3d3cd18c5f757c6f8bda1b2a SHA-256: 1124989beafa50a63301f6aee2c16020ffaa476b9290743b702963213141e416
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these malicious actions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4495

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=black+shark+4+antutu+score
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/256c3267f7770b84a5493abce23c9f93/80615000857.pdf
    • http://younewstoday.com/task/userimages/file/rakadamufi.pdf
    • http://eskuvoiiranytu.hu/blog/file/2961734366.pdf
    • http://annamsaigonlaw.com/upload/files/sowubitokele.pdf
    • https://rakowka.pl/userfiles/file/wozonuli.pdf
    • https://berettyobne.hu/userfiles/file/23010788328.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/96652612403.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f54687af26253034cc574f9d7f146f42/80466439535.pdf
    • http://mispuntossaga.com/campannas/file/fosunarixem.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/85394987586.pdf
    • http://mrukseo.pl/userfiles/file/44526360326.pdf
    • http://lyzebrno.cz/userfiles/file/40557441666.pdf
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/loxamalija.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3f500bc7a684181882e7ca0c4243d52e/tineriziza.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210909_5C2D324FF4EC1162.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161375b269d0cd---muzobolorewuvux.pdf
    • http://www.hausman.eu/images/wyswig_images/file/levapanaloxude.pdf
    • http://terremeraude.com/userfiles/file/bexikusisop.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cd85e9a70045f22b3014f58b2db2cb3f/19317978776.pdf
    • http://cecev.com/stockages/files/dudadoxa.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/63294362258.pdf
    • http://moderncarrent.com/user_img/files/fefozazaxodukowe.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cfc.bin
7824ea1aa43c9060d29cad8824a3e8fef9ad9fa74bef6fc5a147b33bfbd57de3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 10560 bytes
font_01_sfnt_off00012528.bin
e4f13dbca5a3af82a83ba454b777e588bd776c9a0e337f0cb4c2263ba918f9a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 19404 bytes
font_02_sfnt_off0001575c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1575C 16792 bytes