Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca0ad1b9e4ca83b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-09 05:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef9bf584d5e864973b6bc22768cad20b SHA-1: 8e32f95c0610f033dbfef0db511ce362e652729a SHA-256: 0ca0ad1b9e4ca83bc5e5a52afb135b7cd29ba014665ed873bdabeeee664ff157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jqgmd15vorio19v0sgcme8u7vl/20363501405.pdf In PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/xarewetekuxazezekiwowek.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/26691181042.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/1352396143.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff4a0c533---zekazinibadopikef.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/18756853365.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/92785275075.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e49b6ed61---kobixepokeruluzatoxudapol.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb5b99627---gobamuvezubojatiku.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea32b5666---13200180815.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nanixelilaxizevajakob.pdfIn PDF document text
    • http://atek-ent.com/upload/file/dixefiputapusoga.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/39912753615.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f9d116bcdb84236bd54ef80dc9a26b66/273014262.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7db1577d---xunepifujelib.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/80583bd361c60b0de2667bbfadd77da8/reborujufurularetu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/banibijasabixafozewo.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/42632001830.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/052edd5afa6872ebfa0cc6c6825a9d63/15849567840.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/59394814052.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dffd1f7e93d---jeripusurizusovameposa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=airforce+y+group+previous+year+paperPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 1940 bytes
SHA-256: 812a1adb8c996d43eb3d5c1f8771bfe51c5b29e86d60236a6d4ac38b7a8b29a5
font_01_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10668 bytes
SHA-256: 4b27148772817af7d39bc1eae173545a44f4a0e9f4a929117c585aa46c6e6534
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 17660 bytes
SHA-256: 2c28b64d90f70f1c3be70f10be9b6502142f7c59ffef277a5a6e392e6b3ee0d4
font_03_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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