Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa20acaaef78173…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 07:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3818e378a6cce23302dade1864102f75 SHA-1: 2c1d83ffa7c95589e24bb012d2cbc9098889da03 SHA-256: 7fa20acaaef78173fa21b4a1de02040d2fb3bb073561ef8547e26aac85e482ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=wifi+calling+in+redmi+9+power PDF link annotation
    • http://parkety-patemal.sk/files/file/98042306316.pdfIn PDF document text
    • http://kaies.net/upfiles/210914015219026492nl69mj.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/53412221769.pdfIn PDF document text
    • https://angkagenap.com/contents/files/nokerisaguna.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/55650838617.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/46703243676.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/78985987443.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/7450404267.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/bogokopalobusezebilaxuzej.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/nagatoxefokemen.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7d1b3c54---luvekomozitidetazatat.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/jenakanujopozafabulem.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/49314571639.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/de452e5aa57f17b9c01b336c28d7d0e4/1949614138.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/suxesoduvonawimasiwalu.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/78092750724.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/9309708564.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/96764042951.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc9c23191---42792985007.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f1bb0aa4---12142524210.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091900061680554.pdfIn PDF document text
    • http://gardatrans.com/content/Files/gonokug.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/zokudi.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/8179434252.pdfIn PDF document text
    • 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_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 21004 bytes
SHA-256: 7b2ef2f9d23b158a19bdc6543c5d97e9e52745b071eb58435260418887e062bb
font_01_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 10944 bytes
SHA-256: f36be820669e232014b1ad330aff998a7ebb19e27be2f8055579bf70ceb0ae87
font_02_sfnt_off00013b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1