Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22809a2755f7741…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 03:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9d94b3fb53fdaf502eae73e227e9ba7 SHA-1: 0d1a485f41154ca54c84c54b99fef6d131f8623f SHA-256: a22809a2755f7741838ad8cd4142aaa72a2434e8875a0e1164681be41c7b2cb0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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://tranthachcaodanang.thicongmaiche.com/uploads/image/files/37156918993.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e67f3c5d05---83399090438.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/fasojakusujudupip.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912174645.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/34251950377.pdfIn PDF document text
    • http://upakuika.com/img/file/fibitukefonefugodebejom.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/tejosenedexop.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/runez.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65f7d4bd0---20967254592.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131408e20fd9---zeludaxoxigonis.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/fojupexogulexevopexofis.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/losedoguwowibutofese.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/tuwiv.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/tisajetotix.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_B25CD38CEEEE7655.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/pigibodu.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/rajogusavexuxukureleg.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8534738257f0c7000ef86098ed4ed820/51830224662.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/47342991034.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/99581578058.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/marigu.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/ditigasaporanedepupe.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/45154815869.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/23798914504.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195447279416.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/22694755018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=low+range+phone+2020PDF 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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 10412 bytes
SHA-256: 4d687113bbf021aaa336d32f4966142e499dd0a7fffcafbc10a5bc638b339760
font_01_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 16752 bytes
SHA-256: 420dde6067298c725ccfd80927806eded75ff587f0e5ede55c4a295f9a3a1b12
font_02_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1