Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a0240e51f32c63…

MALICIOUS

PDF

92.0 KB Created: 2021-07-15 18:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d2ec6393561028107939bf93dbef76c SHA-1: 261da4135e4f3e13a5daeed81667658fb96bccc9 SHA-256: c7a0240e51f32c63b34d60b3a19ce1bfa7a7abdd9eb07e23ec8ff1ab3c2e47af
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://newtarrytowndeli.com/uploads/files/66576197648.pdf In PDF document text
    • https://diaochue.vn/userfiles/file/44081637178.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f3957d0e47dbd835f28274fb7f0734e5/52699464456.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/0jm01o7cn3nff8t4q92gno5hf0/42475788210.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930ec063954---33332715556.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56614b0a8---50857534626.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/66999701674.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088a22829a86---89017921263.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b077adb2746---nipozexu.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/texaxezorozolimow.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca9912c3b9---42318545366.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-25/20210525061534584242.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/80b2b9987a753e0aef7df4d6847e2ed0/tapagowigef.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4ba2badd3153a223953c8f82c9ebadda/sumemazo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eac400b82---67709877435.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d09cfc94---tisidofuvosuperetegul.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e31a079993eb4b67e95f65e6da5c5096/17669752216.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac651f1fe48---50493890826.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a10b74fc---nadiraditosuzawexivuz.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/monujixewidulezesot.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fe36bb70a893bb10510a737ab319d650/budesekasipumavamex.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/89291772790.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfafacfffb---59073777488.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/42410808508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=spirit+and+song+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 17476 bytes
SHA-256: 795875d0905eba46323f06e87df286f7b5f43518643aa1b3227ae7b4dea8e00b
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 16932 bytes
SHA-256: 096cb33c72073c55380b2866724b91cd0f036a88f4930612da2219934182e203
font_03_sfnt_off00014a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5C 10572 bytes
SHA-256: 0cd4845cbe2285a69759d483c1b0656b8e35ae5bbef8cb8e58b27b3d36ad4e24

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