Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37414d04f1c5b9a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 17:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65e967218ca18d980e4e2c49a3b2ab39 SHA-1: dcc08b3ff476db1f1af48559878caac2f91f655e SHA-256: a37414d04f1c5b9ad3d5c804afc860e9134b4a210e393101d14e42a487ba0031
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution through these linked PDFs. No scripts were extracted, but the structure strongly suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5249

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 http://chamdure.com/DATA/files/fabupetosumuwilexida.pdf In PDF document text
    • http://whatcanidoforyou.eu/publish/file/kudedajig.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/9934653085.pdfIn PDF document text
    • http://lawngo.net/fckfiles/86102874050.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e855604e8d---vidikaf.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4f36f322---31726066842.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141389950953---50340683639.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/37576879380.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/67809130870.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/22102155684.pdfIn PDF document text
    • http://apothepharma.com/upload/files/xolunawivijezuvezufolirav.pdfIn PDF document text
    • http://vaynhe.com/upload/files/betopegavovasabexazurof.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/pofamokanukuje.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wojoliwufage.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/16564324234.pdfIn PDF document text
    • http://poultech.net/d/files/2273338899.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/39094007334.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/vofiwefo.pdfIn PDF document text
    • http://dakov.hu/_user/file/41558076795.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/numapovagizusijimijebaxo.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/pibufexetakikuxisuvep.pdfIn PDF document text
    • http://salt17.com/userfiles/files/70765789533.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/donozedaxozun.pdfIn PDF document text
    • https://eguiders.com/uploads/41246662175.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/248723466.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/16603499612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=disney+hotstar+apk+modPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 10816 bytes
SHA-256: 6c03f538816de6e1f4a1d4a14adb13e99e89eebf20eed16e6e258752eedb82e3
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16464 bytes
SHA-256: 11237926a72c4f9c4615f4365d7cbd4e5e75899c5ff4c4a1c10d1a95057cd860

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