Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc93770be18849ee…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 14:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9335f6052afec13fcc21e52106ca62ad SHA-1: 2d7a3f0ba9275bb7866e627f52f3b8dbaea9b5dd SHA-256: fc93770be18849ee230a2364aaa60bf780f4c72fa274a9bee0ecccb608863fed
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are designed to lead victims to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160761fb77cdbe---45995434424.pdf In PDF document text
    • http://chromavials.com/d/files/39706586973.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/luzanemetirifipigov.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210707081028.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/083cded38866831263d71afe3f74b5e6/96182571176.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/vajirovuxokuzug.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec55688d6---suzadoposibisenomurudid.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/88251397494.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb8a6e6e---bunafofunopobabufon.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5420a2030d---famukigujuj.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0b2a9399446a5d28e8dbe4a18a1a5016/sadibejokusatuwajepub.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee7e5564a---zobijarodexetibow.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///pazagaviw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b311ebe6f6---67610269733.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/22583753041.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/milasegoligozadevefebex.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/womezodox.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d541b98e434e3ded2c99ee04974e172a/31074440469.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/80890878151.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/75083859221.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/78207155143.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/famufusekazukositexu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/o4l8cqcu7osspsiipq2he7i1bb/31524480977.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/lasaziboguminewow.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/regevorusiradukiwututifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=drone+phantom+4+advanced+manualPDF link annotation
    • 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_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 18800 bytes
SHA-256: d2b07725a78bed275c0904c74b43a4629496b6fbb25a6f673f5011da6c76eb3b
font_02_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 10764 bytes
SHA-256: cbbe2c2a4aa8f906a0bc156d399a075d335e2e42814d53086b15c7681d16809d