Malicious PDF — malware analysis report

Static analysis result for SHA-256 e245afe52fb7e6fc…

MALICIOUS

PDF

125.5 KB Created: 2021-08-04 20:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: fe387051d08ba2654042824b3ed774a4 SHA-1: 9e339fb5206c748b5c7aad88340d7890a37f8fa2 SHA-256: e245afe52fb7e6fc486fd6920fd9871c8ddefaec675a0a2d3b2096fb16436abd
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 0.9802

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://mszukam.pl/dat//file/77876143104.pdf In PDF document text
    • http://arebiatours.com/uploads/files/subinewigimizogufuveto.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160765356d54f2---31580425935.pdfIn PDF document text
    • https://mollis.rs//files/24667162632.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/lexezolimorusaz.pdfIn PDF document text
    • http://splogservice.ru/content/file/buromorixaxenik.pdfIn PDF document text
    • http://zatacorp.com/upload/files/14543214409.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ganegowafabomukavil.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/luwinugonegujuvanaguneni.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/gunazelakukaj.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/38926575621.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/baf5aada19a527192b08be026436ec72/21091140000.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gewunisitanomonineviwe.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/ranududopeki.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/14483501656.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608980679db55---fiwuvufipusiki.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f2336650---sodefesapuwepiribod.pdfIn PDF document text
    • https://jetaime-shop.com/files/32747166702.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/2300607017.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9388701c0---lunasupolefunenenekixo.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/60718122772.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/42569698378.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0225e546a---mirewitopafubagiri.pdfIn PDF document text
    • http://jar-ted.pl/file/81726364124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+happened+to+the+sears+tower+in+chicagoPDF 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_off0001707f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707F 19200 bytes
SHA-256: a6adafae955f106419dccf3c268ec4cfa8c4946ec59749ec280483f83d41b758
font_01_sfnt_off0001a1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1F3 10824 bytes
SHA-256: 3a51ab7de8f8846f979d3d20098f620f2ace95a001490eb7303f07aeb31804b4
font_02_sfnt_off0001bac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2D1 4928 bytes
SHA-256: b0c1176baa9b87c8a68a12495bd30b61b56f2109709fc968a6d622d95af899dd

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