Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3983aea3e6e642…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 10:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb066b69d64f11ce4fd531b74dd2ae43 SHA-1: 9349a274aabaf037935aec4bd640fa0f3c27405b SHA-256: 9c3983aea3e6e6427949296ea1a8cd4142a826fb58d31543f16954c2c39780d7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and multiple URLs, some of which point to compromised CMS upload storage. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. The embedded JavaScript likely facilitates the malicious functionality, such as redirecting the user or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://reparation-mobile.net/userfiles/file/55790401983.pdf In PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/82000269594.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/68028923252.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/25793384413.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tbi9ao9912invuiukjeoclsgot/54611916695.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/56411083496.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/59184274398.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/manogifufanuboladotawal.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/84051638513.pdfIn PDF document text
    • https://eniedu.com/data/file/20210901125224.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/45010766296.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/8257624510.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/87594970252.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/54682489266.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/tegepujilunewepasaboxodag.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zezasatewivajejapuvera.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/gosiwonikimoburim.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091019225140.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/22123821819.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5ba35f1e---38457359240.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/48231848006.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fifefidimefapuve.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/fatedepu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bgiib2o8on2tpvloe4adlsfhi9/52719709078.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/gikaweliviginax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+enable+call+recording+in+poco+x3PDF 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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 11012 bytes
SHA-256: 49f19e4d9553b5be12ca579a5a668e71fac544ce600aff367cdf174b4263a8f2
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 17876 bytes
SHA-256: ef41913296c9d5fedc058f98f4fe2f001d236733eecf9175084a8cd1ed946fc0

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