Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72a866e19e7c00f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 00:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45978e9381ed5a5919468103b29c4a80 SHA-1: 2be0d27bc078a1241e5d28da66c085cf0d680db1 SHA-256: e72a866e19e7c00f5fa9899fd1a16eb9771f33452e7907315f35899949d5dbc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=redmi+9+is+gaming+phone PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75f18e0c5---gufalunideg.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/puxuzidaxutu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/lexowemeke.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/genusafekop.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/vowikuve.pdfIn PDF document text
    • http://nensi.si/upload/file/15566201921.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210902_052058.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/zepob.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/47827140377.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/33403288129.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/26593682576.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/guwuj.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a696a075e---jorezob.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139389a94de1---69901012060.pdfIn PDF document text
    • http://leruichem.com/upload/files/21376143822.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/selajufexerenotujota.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ganikikafokuvegizovepizof.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/91428014782.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/78783816103.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/9467731421.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/65345870157.pdfIn PDF document text
    • http://chpcentre.com/files/file/54077015827.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b201d288f2ce6f7616c49f686a449835/76367981058.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/walosumafafi.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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 18676 bytes
SHA-256: 5da448da628fb2cf81c91553bfba99723a3d7d3890c34d72c2d0ff020eeb559b
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 10808 bytes
SHA-256: eaf24f490b6a5a5b847efae671fdf2a02750b015ae19f8fcc3bdfdbd343daea9
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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