Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab90caa2a35a469…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 01:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2c5e98e236703323aea96813758cbc4 SHA-1: 5a5e973b72b8804cd6bef4eb559f0b00baedf742 SHA-256: 1ab90caa2a35a469f3dc1c1e201978c3831d1371e361401d924b29e1e4d004c3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6343

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f930296bf---55070106117.pdf
    • https://snqrsl.quebec/upload/editor/file/91286984378.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ba0dd145---zonetuxadifewuvemamu.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a3a2c3b73b49fbdcb350d7eaf26e3501/sosifemoruxur.pdf
    • https://bistakalikotenetwork.com/userfiles/file/xolososugelunuf.pdf
    • https://masihpt1.com/contents//files/14943152234.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/79223242324.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd1324153---nekurakaja.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f01d4d2c2---basutobokatebeluxef.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42fa8028e---zadukabab.pdf
    • http://dailymaytrogiang.com/userfiles/files/patoxedixeritaduw.pdf
    • https://associazionedynamica.it/uploads/file/61325209482.pdf
    • http://agendaalzheimer.org/files/galeria/files/34434608019.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/fawisezuroz.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f723f5cb9af096a080af78cc9a7ee511/monudenanopez.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6236372ca---60754172092.pdf
    • https://bhsbeacon.com/FCKeditor/file/wivexumamozedadelamuze.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/jixasaxokasisiganam.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name//files/48760344555.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f23443b1cc5---mimigukepeninini.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lddmtk388lobiu7dio03uf7foi/26464476198.pdf
    • http://studiolegalezullo.eu/userfiles/files/suluzasuzimikilitenidug.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/sbdhl2qe62fj4lqlbfthi9k0nr/lafozigulejubiwani.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=iron+gate+design+catalogue+pdf
    • 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_off0000d7d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 16792 bytes
font_01_sfnt_off0000efe2.bin
debbd15ba24a0f23e72b293caaece839039da8b25a55aa8ccaef4d06b4df1645
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 17292 bytes
font_02_sfnt_off00011c5d.bin
893c6f7f7ec027a78bdbcc2b54b9e6f47357043ac9d60370dbfaac6f0aafbd91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 10848 bytes