Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb788fd2ef3d91b…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 05:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7f42d8123842bdc130597642cc91892 SHA-1: e9c71a0bcd4f4b3f5d40626c4668721f43c6ea08 SHA-256: 6bb788fd2ef3d91bb68ff32b090b7433e4a44b7c25ab51f5fe4e291982d1657e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or redirect to a phishing page. While no scripts were explicitly extracted, the PDF structure and URI heuristics point towards exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866aa754a0e---lefonovigupujonewerokogam.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8823f673f27c9cf5c65cb8e9095a81d0/sobelelasunik.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44523241df---18084866917.pdf
    • http://jtour.vn/userfiles/file/supusob.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/zizog.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cms2ifvd2mk5eb7hs7bb32jmao/juzixumogugoru.pdf
    • http://maxbrio.kr/files/files/dijoxuxarokam.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f44760e80---63205898355.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94ae5e69d---14957408484.pdf
    • http://kasintorn.com/images/upload/files/79421029505.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a7974abb776b6af35c08d1891b3c0f00/xixasunevavawupi.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8hb35j847o7nv58o7aujavuqbj/rokajazixizanusiz.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e6jtshou1r88ibu9poafopoeb5/79385422589.pdf
    • http://np-laser.com/upload_fck/file/2021-6-14/20210614205814189907.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094a56c0f36b---7087357549.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95431e70c2---jekugawuzanerokivedupe.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755e5537b20---xarogutodep.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/jefekukor.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c03bbe1---23533429348.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/985a19259c30b36ed18ad3b727e57dfe/59014076412.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/510f4d2c8fe1b8a9ec7104284823b707/42883987051.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3c0f488cac2d72d2c582f9287cfd227b/88382500469.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+your+voice+deeper+female
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off00010065.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 16792 bytes
font_01_sfnt_off00011877.bin
0d7d537dd11b57a5a58c45770dbf321b04abcf8b4d6abbcb3ed83ba5a220164d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 16800 bytes
font_02_sfnt_off000143ea.bin
4a3eb885eaedb98a3825c5f54de479dd8fe4ae6ef108424b7cfeec10cae64392
pdf-font-stream PDF embedded font (sfnt) at offset 0x143EA 10960 bytes