Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a78d02e04ce2882…

MALICIOUS

PDF

62.2 KB Created: 2021-09-21 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e11add50a82994a7a38e46de0eac19c SHA-1: fb6db5cb55a5fc1d22f4d03124f0aba0df534f0b SHA-256: 1a78d02e04ce288270af2d6bb0c1755f788031bc1aa8492847f20876c68f99e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6561

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://huntic.ru/uplcv?utm_term=bee+tv+firestick
    • https://wtmasonry.com/ckfinder/userfiles/files/pimatuzevuzirewedi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb481cce4---22030948981.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/14990401717.pdf
    • https://hoangnhataudio.vn/media/files/6024127028.pdf
    • http://shanghaicruiseparty.com/uploads/file/11544646908.pdf
    • https://pezenasenchantee.fr/userfiles/file/bejejisa.pdf
    • https://armenia4d.com/contents/files/balajoxin.pdf
    • http://amindoost.ir/images/upload/files/50787380528.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/rediximimukonojodirufexoj.pdf
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/duxuzufimuwavidas.pdf
    • http://hyundaihungthinh.com/uploads/images/files/8454460723.pdf
    • https://archielectronics.com/userfiles/files/15109318864.pdf
    • http://computer-rudolstadt.de/upload/file/28411802800.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614253456cb18---lanijutenefu.pdf
    • https://fizjolech.pl/userfiles/file/taxokenutarivewadudus.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1a26f494---86805865554.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zisemeleburepuvovoboveze.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614089ca37a2c---kajeverafijosefogupixotek.pdf
    • https://chsins.tw/uploads/files/202109020103174639.pdf
    • http://falconfam.com/ckfinder/userfiles/files/64643393042.pdf
    • http://krakowska98.com/zdjecia/fck/file/fewenunulijiserefa.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000add2.bin
e952caaff04cdbce07ded61b5603dc0571488a9c249c657e780322cae6a3079c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 14964 bytes
font_01_sfnt_off0000d3da.bin
167d79ea520d7875765a22caebd9fe294f13b667b9d907d42825e578e3181332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 10108 bytes

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