Malicious PDF — malware analysis report

Static analysis result for SHA-256 923457a816bd4bda…

MALICIOUS

PDF

69.2 KB Created: 2021-09-06 11:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61711b2e2d5e71f1190100c4b4073210 SHA-1: 2ec42229c5bcc86f665671386cf1c63c680e4d2d SHA-256: 923457a816bd4bda30f5c676512b65eaae82221afbb1872a470bc03c5598e880
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, with a high risk score. It employs a common phishing lure technique, presenting as an image-only document with a click-outward action to disguise malicious links. The embedded JavaScript stream and numerous external URIs, many hosted on compromised CMS uploads or disposable domains, suggest it's designed to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hglobaltourb2c.com/FileData/ckfinder/files/20210724_6836852E5C0CB7FC.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076570bf1fb3---bilezo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4fe8699d3---wijixuzusenip.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff9e44b8f---puzevibanarodatuj.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d510401da2---lojimegofud.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/p1uo5gmf40neq3617pglq68kr2/vetesotakanitinufuvojowab.pdfIn PDF document text
    • https://areicon.com/images/file/kusenepateni.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/wuxusokamid.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/livawogavom.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/48509910937.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ab9ed9730e8ebc0c620e6383ff19ad4/ligepaxanojesivizilis.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/podadiwevalosuvinakuwi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i9scmmvfv6etd6tmu2gsqbhida/guderuteni.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/delunap.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lo7dedfrjtf0di7vvjqhj9q7db/vabulisiwazopipe.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/62343526100.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/lepenebumesof.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0c190c375---92782962050.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/41054404798.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/44f3225bafcd41df12d68019ec252bfe/xulidopaligulagu.pdfIn PDF document text
    • https://negaratoto.com/contents//files/vajimulixutatevixinin.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f822e8dba---50111421526.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/aa34e6e30c8b4c0c55511be11264baa7/63989219046.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/fa6aa2556e5a7d18baee8a817def650c/visowegeraliruwuzubefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bqs+machine+manual+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D9 13784 bytes
SHA-256: 3a45dab638b23866cca5ea49b9f1ef22e9dce96263bf045516e4103aacfb0ee4
font_01_sfnt_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10864 bytes
SHA-256: d4f8140d740e59a2e1121d152a070bb1228293d6b10795b3941222ba8e4ff528

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