Malicious PDF — malware analysis report

Static analysis result for SHA-256 144c14c8e64864c0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 07:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 645422de142cf5fc9f04db740c856817 SHA-1: 13ea74e2ddf69c6de76e814f389f4b1b2c11e1ef SHA-256: 144c14c8e64864c06d90715f40fccc6013f386f9d2129e403c808fa2e8e5236f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=android+nmea+output PDF link annotation
    • https://takarasushimn.com/userfiles/files/14282708412.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/regitamiloxerisi.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/92793923087.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/purarosudowazilenuzuja.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/72337531075.pdfIn PDF document text
    • https://comfort8889.com/upload/files/mekumojozed.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/leweludulibitisakuk.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/durapolinux.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161314841a0a83---dejazujimuviruvugusu.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/32597088608.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/bewurumofubexelipufadola.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/niwodekiwewutujod.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/29153888796.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wokelarojulige.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/pibokivaxaf.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kitapamoxaxasudul.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/zebetajubeme.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161354e80374e3---juvawumimexipakalijep.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/12896868634.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614013447acef---21199517675.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/59357523690.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8fcc9e7a---8937892824.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210911141434.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/lilalumivajutupiw.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/nuwanomimepexijurapagofu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 18236 bytes
SHA-256: 716b6585e8c2a6257c9c7843c3f7b28e4552ae48fa2cde0ad9df660d601b2643

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