Malicious PDF — malware analysis report

Static analysis result for SHA-256 c681bc75471b9b0b…

MALICIOUS

PDF

117.9 KB Created: 2021-07-05 20:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f79267caa7165421fa67e5fef3fed0d SHA-1: 378bf369c935b0041819dcd18cb50cbe4141c828 SHA-256: c681bc75471b9b0b756e63f744afb7ab09d4cb82c7350118b058da372f997944
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites. The heuristic 'SE_CALLBACK_LURE' further suggests a phishing or tech-support scam context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=the+electromotive+force
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d65d8cbfd---dezibamujagezedakux.pdf
    • https://caribemed.com/userfiles/file/jazadafilenetoxubal.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/fonimolasakizokaka.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3cb95e3427c1f1ddefb8325a71464630/46846915562.pdf
    • http://mobilesamara.com/img/files/file/25937391037.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160832ee36c19c---menobekipezinofikopa.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/79e59d7b896f09e84d27ebdba8222238/7352981262.pdf
    • https://oriental-kitchens.com/userfiles/files/mijuto.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d917179d4e038d40b15a99d58607893f/37561033335.pdf
    • http://plafondchauffant.fr//img/user/file/gegazepodu.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/cas2n12mecugahqu3svgja77a6/piwebomurawolaleguwaj.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518001124528231.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ksr80bjoluqrrpcfrc64s8lthe/88911062208.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c23cc6d656d---25105674511.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85d097583---mosawunitogomeja.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de377c2ec3---51544560720.pdf
    • http://re-view.online/fckFiles/file/15917259159.pdf
    • http://aimic.com/userfiles/file/87814631219.pdf
    • http://vimar.ua/userfiles/files/24541286265.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/muxelojomoxogi.pdf
    • http://andlupa.com/userfiles/file/79517407016.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/0n0fv494tlukqp19jrn6s9hme4/7990963581.pdf
    • https://sanmuabancongty.vn/images/content/files/woserid.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/gajinonarer.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/18630424566.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fc8.bin
078b9fd1cdba4f8f17ee55f343ea364ed6a16547388fd1333dbcf53dec871239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC8 16604 bytes
font_01_sfnt_off00016736.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16736 16792 bytes
font_02_sfnt_off00017f4d.bin
20b99486753e3715731fbb8c6c10f13daa7658b1fc9c36e5c955efe9fe90b881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4D 10196 bytes
font_03_sfnt_off00019625.bin
bfb89005b693fb6dad908d27f246dc679d7d4505a387c7d9620d2ee149fb6e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19625 19548 bytes

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