Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5008f42f75fbd5…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 19:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 80fc95b3d6ba4a5177582871e4f081d5 SHA-1: 95792f961f93cb8dd82791791e60ae91306346ff SHA-256: ba5008f42f75fbd59a7f2b9aaadc5ea73ba217f5ca3f1ed56b5e6dfde649e53b
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially malicious sites. No scripts were extracted, but the PDF's nature as a link farm points towards initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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 https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3c2e8903872f17ebc3a2e039023ec8d6/51893888004.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021525130415424.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/doligujuvemaluwijugiguda.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/bitadon.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161289a8911e4e---xupotulinomezasutu.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/56976041343.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/ditimexefafiwewelaxog.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/570cc34d7fb28a3f9c337c24fea14f9d/17051341395.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/82012493239.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/wonowoxutevojoboko.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa07e1092a---voxepi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160aecc4c8ef7c---zemopuzilusonujuduropo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/sejowowasoj.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/69108567736.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901b3fc33f7---dozega.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/gozejikit.pdfIn PDF document text
    • https://kham.vn/userfiles/file/1718395961.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/setarafogi.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/35006888587.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e483fc6c1a---moxafefixaluporer.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a258092f049---pixokudaburomotakubime.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5c78badb1---dadebefakubosoruwupid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+lottery+shirley+jackson+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 11016 bytes
SHA-256: 838f407e0a507fc1900913191c0aafae95d53cd4c262c385e9ce5546c73085fb
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 18232 bytes
SHA-256: 0c9185c7e63a154e36f816dc2e93668485976fd873dbf64dce38b37c0038e008

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