Malicious PDF — malware analysis report

Static analysis result for SHA-256 65185e0c0d2fc4fc…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 17:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f56991617066449fc6401fa3482380d SHA-1: dbf20abe838ba65cd7c8470bfef13b50318aa392 SHA-256: 65185e0c0d2fc4fca1a90796300c1e8ecf64b11e2bf441a795e826353374751e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to compromised WordPress upload storage, indicating a link farm designed for phishing. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic specifically flags this as a credential phishing lure impersonating PayPal. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attack vector. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=weeping+willow+toadstool.
  • 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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o87rrm60bc52g4s5jm44ppr4pi/56388325879.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be0ec2503cf---loxusoridi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f02c4a59d0fb37a6d9815db58aee5d04/86142496693.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/62459856591.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6f5778ea---49801427816.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/70a57e7c71d054d288859d6200f8c2b3/ximegerusiliniv.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/34488175167.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/70752412020.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/57d95ee6e97d1af162898345baf7dc20/mavirakagatiguzan.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a600c2809---bitonanofinuvibizerax.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/54855224213.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a550c75f---73433730204.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1bjgkurkl0nd5u49rhihtbplor/wakatukedos.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb882c6913---pagubasawamitokita.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/28646960237.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/ropurinupemoluwofuf.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/15d2120b49113852c98fee901e774d1e/5315617119.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fivubu.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/jizixexe.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1f780b5e6e9ea5f0ece90534a44614ba/mevufinomupo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7baa4278ca014455c6fe336509dc3e5e/kuber.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35e6b2a173a26011215675b727cb7290/94656148771.pdfIn PDF document text
    • https://bczenekar.hu/files/file/68830717314.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f8ef8c96dd3d0345a39ea183220fb962/lejizupar.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b8c9fb4b9983a1ba1faf84227d2cb810/777064175.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ea07bddd1082cdf6af1d8e46576982d5/xexuwepojuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=weeping+willow+toadstoolPDF 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_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 18668 bytes
SHA-256: 70d11b4c25dcd1bd9d5137b35050bc6292016c0b674349302755fbb4df56577f
font_01_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 10544 bytes
SHA-256: 232d8f5c58631137fe124fcade95f2ba7bd336f7b0fcc45f739f7ce156f64a97

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