Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab89b7cf1a47685e…

MALICIOUS

PDF

81.9 KB Created: 2021-08-02 13:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19d331e7bbadd1d7ce4d3c6b31637de3 SHA-1: 50c486736be3564cb6e635fa8ccfa7c38f2d9eb3 SHA-256: ab89b7cf1a47685edd162b3d4d153b3f1a05aa5e21c7309be1451ea5963e6f7f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely responsible for executing the malicious payload or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=barbie+dreamhouse+adventures+apk+android+oyun+club PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a69872488d---49128875030.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b085f046511d5534a658f9098f3b4025/4443348904.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/39717579405.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xubejalezarapivukufigunif.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb874e573c9---2662801666.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/12908445987.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/sokisasizoduwipiped.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/79709455222.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/27079097165.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/naduje.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b61e3a0f9---bepoxubokalakixonopode.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6841e1bbe---bifolusepizev.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210728_090843.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/tebopuwususife.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/lalutov.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/maguvigupeveseb.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/zeguxadobunivaxaxazomido.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c438741d49f---69483457722.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab23793e0---tijajin.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/7c400514e1cc383f3e4fe3c9180a8660/gajiranukebegujinezulov.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf191e585fb---getorotegafabuxetal.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21d31536a---48909082353.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/dodabosubibokilixed.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zurukore.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/fupufagumopenisoxiw.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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 11344 bytes
SHA-256: cc92edef13b08eb16475a02fa716b2e901fb0d13c35d6a8383a830b6aa6beb0b
font_01_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 18132 bytes
SHA-256: a7977e7362e31822228887a7a7393ef70f69fc04948e6eb57f33cd08bb5a1114

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