Malicious PDF — malware analysis report

Static analysis result for SHA-256 061badcdd00b1140…

MALICIOUS

PDF

85.4 KB Created: 2021-08-15 04:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cde3c5497964ca7cd33a0150357b035c SHA-1: 8f6dce089a6f2f9b1c1d17b7af802d3170c62881 SHA-256: 061badcdd00b11406beaff7b116c2b8a5aa0e2fc21ff60a4f8e2e75b4b8af812
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vitanova-cattery.com/upload/file/32654260062.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gvir854m57ajdr0ncpvrmv4at1/54036169702.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb411da88b---saxodilasukok.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/45468052524.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2692bfa65e0048849f0fc298d085f965/xogil.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/70276666419.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8c68e6d6a---89189455129.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5en79rdvcjgd45piaa02e5hb96/90138683612.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/timuvef.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/32676169698.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1c173c87cdd01c4b44f7d2e8c716a802/37612582809.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/21674949688.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7525a1a06---fuzagakomimemesezejiduduj.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/serulebaburosekenajajemor.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cd9b83d1bbbaf49256f7860ad633c1ae/zinusimib.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/jaraxonumawuxojo.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/7194199609.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/bivusuk.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/sovigikilifejuf.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/11722471786.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/fokuvigosazujirepasali.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108150651515062.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006a6cddd8e---79987728341.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/paxenali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=where+can+i+watch+twilight+eclipse+full+movie+online+for+freePDF 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_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 11172 bytes
SHA-256: 28f5d9dbed87d868565b96ba0bd82aaefbd1389cc2d881aec6e001eedc14d17b
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 17252 bytes
SHA-256: 8a7dcf5d4f56d9e625f767884472c85d4fb20837608b68044aa408b67001bb65
font_02_sfnt_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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