Malicious PDF — malware analysis report

Static analysis result for SHA-256 9670b51b0a40cf8f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-25 02:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e76d8c81455355666dc9d356bbee122e SHA-1: 775764c24ff9f8d337637b039b9b25dbf228f01d SHA-256: 9670b51b0a40cf8f9994df2e00e4a625de22717c7ac1b0cb695a72edde15ddb5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. These links likely serve as lures to phishing sites or downloaders for further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=cara+cek+imei+hp+android PDF link annotation
    • https://best-of-geldanlagen.de/userfiles/file/palukaviwavozuwusis.pdfIn PDF document text
    • https://cathita.vn/upload/files/40360608800.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/wojawor.pdfIn PDF document text
    • http://bdsductri.com/upload/files/53253509743.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161445dc9a8419---sadepugexa.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/xijokapoxadiz.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cd42c370---99097839423.pdfIn PDF document text
    • http://cartopack.be/Images/file/1604457069.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/53217771049.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/26444635907.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/94564907248.pdfIn PDF document text
    • https://architektor.ru/uploads/file/libukaxafovefegiv.pdfIn PDF document text
    • https://rotitelor.com/contents/files/wuwifejamelobefafogovi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/37234108451.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/vagoximiziw.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394229f0342---vedorosowilumisod.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b20b358e---85126127508.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/44178387240.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/rimizotikividetolavife.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/fudebofulasokipiwufewoda.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/95492146663.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/woloralozamedewomova.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/gadonipulabaduwafepawev.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/26622029.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/23734268579.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/zutidoxakekunat.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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10588 bytes
SHA-256: 6c63fcc6bfc881a2b6dac5dc1c1b69814477a250edaf180122bc69f6c89b69d1
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 16552 bytes
SHA-256: 5ab1b61a69a697fde0b1ff4a6493d20900052660d48ed59ce6880f1e25e935c1

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