Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a450172e1331335…

MALICIOUS

PDF

74.2 KB Created: 2021-09-29 00:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 613d48764c8dfb5a855ee49ba9b8596d SHA-1: 0af0e7f29ae894224a4743b75974666eeeffaf1e SHA-256: 2a450172e1331335b30c5f627d84e0b64e6375d1c9f1df02060aea735feb5042
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous distinct hosts and disposable domains. The embedded URLs, while some are marked benign, are part of a pattern consistent with phishing or malware distribution, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133c277ce38e---ponipalutovukemibido.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/24477387196.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/puruxuv.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/85868025370.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/87594930319.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/41607281166.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/daged.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/34997668373.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/garobage.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/34623941938.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/goziwit.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miwuvebinalex.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/dewusobefigexojadizulovop.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/79459545993.pdfIn PDF document text
    • http://banquat.com/userfiles/files/mipesesemuzevatiledina.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/foror.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/40783658300.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/33481682381.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jupakujimukejone.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9c4026a6808abdaef8a607943a9d0e5a/59957171580.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/kafibedamugoro.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/1696511939.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a02d1bfc764f6e9721c5baea9eb43bd7/73959490841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=play+store+app+issuesPDF 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_off0000bb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0D 10356 bytes
SHA-256: 73acd06a37e86504ca477fb204c9f357663a706306bc3de108c0cce5436a8358
font_01_sfnt_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 18724 bytes
SHA-256: 1ccc45816c729a8e03c000974582a8370efe8d7b7f00c5b4602631a2b8e36b26