Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd4bd9e6f26e1c9…

MALICIOUS

PDF

94.0 KB Created: 2021-07-19 22:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c15836eab0ca1fb1d59d3d9e72f2a50 SHA-1: 81472529b92c75c3de7b61f4a430701d981af737 SHA-256: 1bd4bd9e6f26e1c9fa183072a2812c63352e03369c21df09639be988cb0abe52
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to lure users to malicious websites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

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://twr1115.net/files/fckeditor/file/49458641723.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/14771156904.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/97801057643.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa2fbf8f4---folubefowepudewajoverogo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39f87ce4e---82686823251.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e711635058---13497014536.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098414da96f2---rodagoli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e9b4dc6b---44367938765.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/54531542300.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/35521025571.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/75141774545.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/78462228632.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/57911173779.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738d8f867fa---37535320631.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f436b00d02---tilinugugopapiwujopuxebo.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/e02sfudec9ne8ff1vqgkvcaglv/fubazezarule.pdfIn PDF document text
    • http://rentaruedas.com/files/others/rowularosulimukodagag.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5533f0aa8---76243087458.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7ca9c6d2---95031655664.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c668802fde---juxodoludapakolokevon.pdfIn PDF document text
    • http://turatabor.hu/media/wedegulisizarojosabupafer.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/33602813e7876a3fc0c5f1a593b4fcec/segavosofaruxib.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b723aa54d30cd4d7b7de79af7730fc66/59223598692.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/abdbbed6dma3jd7oj6t21iktkv/71897736197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=udp+real+time+examplePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 10268 bytes
SHA-256: 74f4141b380c5c14888bb1b94af1660d94499335f58b66c203fd95215ff2d02a
font_01_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 16700 bytes
SHA-256: 9c0ac612576e80b290ea3f90c7b6528b4d642340e14a2c254a8ca86efedd91d1