Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b365775532a7d6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 14:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34ac247dc17f7afb038679c7aedc571a SHA-1: 5f1f21c62c79f636771e9572770867f1069c15b5 SHA-256: 91b365775532a7d6587d8e0fbccb3047f1de9ffc699994089ec1c455700a79c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting PDF files, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=approved+as+noted+pdf+stamp PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8cd173715---gelozupiwenuriweniwopab.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e02d34c800101d5d677ff79c03366585/49503643642.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078974863a74---47249078624.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/lowoxebe.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/75437806948.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550b8e48cf---keruvigasiteninopafini.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/depube.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8dd4a5ceba7162b7bb67a7d445703579/vifofujepusu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fajamuvoxofagisa.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c498bbba2b---megaguvopudapamo.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/748d1a89ad16c74a459c664a70f1d745/diropug.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16109bb7b55a46---xowubizepelu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e29c1cec05fad57bf3e7a44f7f901e8e/kurubal.pdfIn PDF document text
    • http://rentaruedas.com/files/others/wosemakaneta.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vimevene.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/memesagubimego.pdfIn PDF document text
    • http://charontrade.hu/data/file/89777310159.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/84461775145.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fda583d3ff9---mimapepogixupeko.pdfIn PDF document text
    • https://kawanmto.info/contents//files/90819451914.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/kefaxisekarovubo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3c75bc34---mebipisifewedopana.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/72961489372.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/afa3c7b255186c9a25774b9e6dead502/takeb.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0fb4c12c---kakawofajupurudipox.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/jukalozesurixukosutimagep.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_off0000ca15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 17624 bytes
SHA-256: 531b54a9381e75fc572d999216f92f124f4f84c4d7e214fcca1a4e86983e0f2b
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 10568 bytes
SHA-256: d27b342159fa037b569b998ed9db599e2038aeb4fef9f67385e6e1836e786138
font_02_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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