Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b263e53fbdd4ce…

MALICIOUS

PDF

80.0 KB Created: 2021-08-23 11:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6611e92576f6c6f306dab90cb9c8bb92 SHA-1: ac6da7e06cc2c86152342d07ad4a5edd3e14ff06 SHA-256: f8b263e53fbdd4cec8c3fa08a9670bef40fa62d8366a66e450afeeb90038b656
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely designed to redirect users to malicious or phishing content, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4163

Heuristics 5

  • 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
  • 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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/eb4043364c14bca82c089b55d88c66ac/xotenumavaji.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff64976ae1---xiwufasabupo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d603c444---wovinenikewa.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e5b8562ad6030c99be9d9121cd61ac47/kibikipupajiz.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/kafedakafu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b53f2fd61---kevoratebamijofiw.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/jorumojotepe.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f9d4987ad---65923612328.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108040844178821.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d979bfa3740ee9f2aee208cb8c06dd81/45698719723.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/cgf9gunp3ql1mnhucb3ctomb7t/romowexapakanejuvagefiv.pdfIn PDF document text
    • http://goref.ru/files/file/55794182783.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b7lhurnkbrhinv4rv8s28q7ep6/wepodisikebipenuxaz.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/d80s1ti0bv8lnnacruv9tdf4nv/tebadedulizujeraso.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bfr3tb8isea9kqrltn7l7mnoi7/wujusor.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/98585218936.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/vanadin.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/tojomazexideresopuwubegov.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/jefijoxisu.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/30459428332.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d19c4038f20c0b9e197a5fa7e0d3ed72/64445427641.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5322a1a5d---sezikuvovunuvavaxu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/noxirer.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/81157261496.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/93049640491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+affect+theory+reader+pdfPDF link annotation
    • 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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 2132 bytes
SHA-256: 8ad1629d78958631526aea0a74d0b163a5252944052d54f78beed5240939c1a1
font_02_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16448 bytes
SHA-256: e272258dd39345a868e9dcaf4c7592a51c63266d4889be4abc81127e640dc1b2