Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca9a64671901514…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 15:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f854c01ffa290a17a2b3ac53d85c69c1 SHA-1: f00d28de98fcbae6d389f22d1a1d297da57a643f SHA-256: 1ca9a646719015147c415731cd1b2320d3d58dea97b5da9f695d5d3cb71c29fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The presence of external URIs and link farm heuristics strongly suggests the intent is to redirect users to malicious sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=top+20+livable+cities+in+the+world
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/fb03c4df0ee4aecd56e59739683fdbde/81898762886.pdf
    • http://spec-so.ru/sites/default/files/file/82706087406.pdf
    • http://www.mab-solutions.fr/upload/file/76434062037.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/76610747806.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/mipafuwuwaxok.pdf
    • http://pol2-simf.ru/userfiles/file/19985732385.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/jujuwurejaledukuvaj.pdf
    • http://rollfactorytogo.com/uploads/files/12301759358.pdf
    • http://domplus.su/userfiles/files/23908341964.pdf
    • https://deitratech.com/userfiles/file/retitipelogot.pdf
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905082321476931.pdf
    • http://rickgrisolia.com/userfiles/files/veteziwabi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132625437eaf---widasafo.pdf
    • http://snap-drone.com/userfiles/file/woxuxoxun.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210912/file/16314502187839.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/16673949017.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/16212216583.pdf
    • http://peoplefineart.com/assets/202109/files/20210919140754904894.pdf
    • http://gardenofsound.com/userfiles/files/96682732181.pdf
    • https://tonwen.org/userfiles/file/79073330439.pdf
    • http://glampingcaravan.com/userfiles/file/20210903123553.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134014ca9904---90907974837.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e093.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 16792 bytes
font_01_sfnt_off0000f8a5.bin
1843d7be89ef9b7aea1abada3f8953dbe808026842cf0184c2560c30ae874a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 19376 bytes
font_02_sfnt_off00012af8.bin
05c775767accfa048e553c34378c1a05b10a5a340464668b74eb8ccd604acae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 11108 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.