Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a81139a5b115116…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 23:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17e42006e948c6e93724e185bf84149b SHA-1: 85b59a6bab2a8b28519c94d2a78d75df15443ba2 SHA-256: 0a81139a5b115116d729d5fb4603bf3fdc4ba553762aee51295842ebe8a68d10
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable or compromised domains, indicating a link farm. The ML classifier strongly suggests malicious intent. While no scripts were extracted, the structure and URL distribution are consistent with techniques used to redirect users to malicious sites or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://adamant54.ru/userfiles/files/vojivuzipitidupevajam.pdf In PDF document text
    • http://panel2conso.com/userfiles/file/tejupavebuzitikomulutewos.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/54515987418.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912205752511031.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/65585082333.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a770f98b75---mopuwaj.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/14179309803.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/xiloxalonopemoni.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/1025226277.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613222e45995b---52466584001.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/wipovuvigevazojuni.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/74334603239.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zivozesalef.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b3d5896f---20841694106.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/72780146928.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/10500860666.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/10796603759.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5ccbb58d---kimemolaj.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/vunaxudebixadawapuxakiba.pdfIn PDF document text
    • https://ratosatu.com/contents/files/61460334642.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/86413761451.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/4019731941.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/m7pqp6iutcej3dm4vob9t0rue0/jasejawere.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/selojixovafunuxelikorope.pdfIn PDF document text
    • http://agama-rc.com/upload/files/xewedabamap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=strike+force+2+hackedPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210904/16307531046792.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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 18384 bytes
SHA-256: 0a080f53dbe973f2fa696dab1967db97a133f3bea02e15314067aabf683dd333
font_01_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 10540 bytes
SHA-256: d09177391bfa5f89c68aab035ee04888dc99259f93b772fe3517564920ca02e6
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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