Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2710ce9ea4a9de…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 10:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85e41e9ef6b8350770d0c70c9d825b42 SHA-1: 8eb38d0d1ab719662ce4a001df692a365a2b5c18 SHA-256: ff2710ce9ea4a9deaf18d68cabab677f092dfe7901105ea2c04a39abbcc0b847
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary attack pattern involves using a seemingly legitimate document to facilitate initial access via spearphishing, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/44627d7c97e3530e5d01206d33672bfd/77129345544.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/109ee905303bea7cc84b43d5094d6548/36676897405.pdfIn PDF document text
    • https://nomortiga.com/contents/files/40847476858.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/rozawufodutudosabozizumip.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/93090339397.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/mimafojis.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/kewitifewulimolezita.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161006e3277436---vaxuz.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/73588656813.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/guvefakadutesiwezeg.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/81338666142.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e23c0915c55---75698994735.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/rijekatenodukip.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/rifabilixevosorap.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f7acac6b---jakikox.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fa4q26habotr1p2edlas77esia/guwopigedev.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f63ec9683222ee44f06cac5a7b42fa82/72385514560.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/70244084637.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610867db9e4da---78063243650.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xudovofoviguduti.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/79830893330.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/jojebanojag.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/34684393209.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20d41cd3d---xobirul.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/jafonabolajuku.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/37609168766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bihar+daroga+previous+year+question+paper+pdf+2018PDF 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_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 18020 bytes
SHA-256: b6b350cbbd21a85f19a75d4ee4155fb5d8998793a56912a6464ad08ebc7e70d3
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 11712 bytes
SHA-256: 6a54e64bd5ee4b180b7ff269e620acf820dd7c6c14f9b69ef01ac5631eec716a

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