Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afe78f28b248070…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7ce11dd1d6eff94990e6c5fd793e590 SHA-1: 7e6c927720aa59e1404fce165808745ff5ca05e5 SHA-256: 9afe78f28b248070e220191f472427a1ecee42e097da79271b65c645de00fcff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of many external links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/26f027oqk4d6v6v8hb7ba5cirv/92863248493.pdf In PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135426cd3e92---37591056087.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/48805225851.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/zawofilubowonadu.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/72642000990.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210909162844.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210911135445.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/judow.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/79096725452.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/vejaforagutovosamorafoja.pdfIn PDF document text
    • http://atomleasing.ru/media/File/2382417069.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/43117918030.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d9e7dc700e3218acbeeecce4430d3582/madutinufetolalevi.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nabugujamuwupajerarab.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109071101179170.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/84845101336.pdfIn PDF document text
    • http://cbstav.cz/file/rupejadip.pdfIn PDF document text
    • https://asi-filter.pl/files/file/dakelon.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/karaxuz.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/zunurewovetawuvororixujep.pdfIn PDF document text
    • https://aneri12.cz/res/file/2842495726.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/78573030748.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zabixezozisakeme.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/nukawodisavegevidesig.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/feteguworunubi.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fugarifilerepilufijabelix.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/83425603050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pearl+of+my+heartPDF 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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 10228 bytes
SHA-256: 0ae5585c3afa4f5c21b4b111d6dc65efb2356500fdf073e14cbca6a73c5c6db8
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 18136 bytes
SHA-256: ba4cd0dd2341973ce66f1375d2fc48fd0c08e740380fbdec2f6dc97609bcb982
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1