Malicious PDF — malware analysis report

Static analysis result for SHA-256 54892452d25c0b20…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 17:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5330cd61da6c930dfcf94689e18ca2de SHA-1: a7cde46cf302d02d1536e70f658dbfaf83c6f4cc SHA-256: 54892452d25c0b2021de02115ac35e4b2d727b76d2c8c3f3ed4d1a9367c8a37d
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, further supported by the high ML confidence and ClamAV detection. The document body was unreadable, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/oudjplfu55fdd2rm9vc62k8ftb/53369376157.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090eaf98dc6e---kititolipit.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fotixepigag.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/nawomizejuxoji.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/tezevosatikesoxuwuvud.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/12457935639.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8pbc6umf8sfqtoftb0370jq0t7/79256419526.pdfIn PDF document text
    • https://songhong.info/userfiles/file/dosijorewikaxakusotuz.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/77ed93718d6a2892e5ac12845dc86980/gopuzalekaxix.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/lajaravisaga.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/52234351804.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/93ce934bfc77b34a1f39919d531edb5a/betomidodatilo.pdfIn PDF document text
    • https://banghenails.com/upload/file/peditudelegukin.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/lasotajiwadejedu.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/xusamepijivofi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a82ddeea---gukuzatotujimetodejawetes.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/86afee949ce349f494d2662937cb82dd/kedilero.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/61f717fd34532410eeeb2d38bb8b4c24/41174008210.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/30361577231.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a53cf5468e8---ruxubuzobakavexutewaboji.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a0c44504---vozomidepamapugigiva.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb4bca609---tonedakabebuzeko.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9f162834c0b4d95b7a46d87f16ec5ccb/gojirumezevebegafelu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a1f009450614804be41b03b9fb788058/9568361905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=citi+trends+routing+guidePDF 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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 17296 bytes
SHA-256: 1393c77ff2f6355bfeeb698a4f19c0507cd33269a1063f5625177f5afe5a61c0
font_01_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 10344 bytes
SHA-256: 8b2910e72328b1a58234981035ab7452b606e3be20a87aba06b00370d713c51e

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