Malicious PDF — malware analysis report

Static analysis result for SHA-256 f818518bd98fa1d6…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 07:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93043a1167b24cfacc812b44b27d1964 SHA-1: 6703dc23ef3c49058adf67703baf2530850326fb SHA-256: f818518bd98fa1d6566fdfc01c74e970cc1bed8fce192554ee62037386aa2489
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or credential harvesting attempt. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to trick users into providing sensitive information like one-time codes or MFA approvals. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=free+minecraft+account+logins PDF link annotation
    • https://searchlink.org/userfiles/file/89940322009.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161362592daeb9---1785179423.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613464b140b09---ripabe.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161406a0d69b7a---76249561723.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091815481173499.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/48361426708.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/39498989397.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/faxuxagawadebu.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/54609828670.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/82042052563.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210913074701.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/wagawok.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/lafavoxoduvemejugowamezux.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/nevabeluvomul.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/nosekovebe.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88001524918.pdfIn PDF document text
    • http://idroter.org/userfiles/files/pegoj.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/64051074091.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210907113354.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109121710115254.pdfIn PDF document text
    • http://skia22.ru/pic/file/61697298315.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/10757766064.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210916103027.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zixutapilimeromesate.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/k9p536gjkls12he132fcp5h1u3/dufugifojorukugag.pdfIn PDF document text
    • 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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 19004 bytes
SHA-256: 8c77a7f9f2cf3eec865b353c0fd2a826fe39b874d3b41ec36d656016b27b193d
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 10756 bytes
SHA-256: 30e59733baee4ab8ea20fe2801f2572c785968bbd413f2d89d7fa0161515b3cc
font_02_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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