Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f739dab0d5a27e…

MALICIOUS

PDF

100.8 KB Created: 2021-08-16 20:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66202a9f904c504bb30801872a59e3af SHA-1: cf04a6a12cb72fbd0fb52ae5b6a72d43033a39e0 SHA-256: 52f739dab0d5a27ec1cc6747c9d2fddf668f0e8a518d3a124521d5cba1480490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fentesmakina.com/paket/upload/files/63694689297.pdf In PDF document text
    • http://allier-genealogie.org/File:/68516926674.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/17521955548.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe52d5f75---zarulezatujubemezewekixi.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/semuxetaneguzenapava.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/2823667309.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fabea4c39---90087049024.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/fimumosapaporoli.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/126103bfbb6dcbe7b646fcf9ab3bed7b/feponamemewivifuzafabe.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/kokufubenoj.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/12781726845.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/58357991098.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/18162173312.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/87e396f49e8cd89e99a5da8f1d82fcef/37808982264.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202108152321298543.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607246b6db3a7---75368700671.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvaf.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5592c550b6---nabozumagoxen.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/83028040185.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7a9c7cab236c89e902405427d2bdbe23.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/44f2c2d5949d377d9e9041b83968f074/41999944940.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/24335026462.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/73119404602.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609224181bf57---fanatemes.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e3cc434fb9432b996fb6bf90dba2ad73/91159247562.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/26705909683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=autocad+vers%C3%A3o+estudante+2019PDF 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_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 11100 bytes
SHA-256: 207ddd72e3b1347c0485a661c9fe03a91ae39cc08d436e79321fd0a3334a21e3
font_01_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 30112 bytes
SHA-256: c79ec87d125eb9f79dfb99558583968a0dc6404a5ff79cfc81a430fa5dcfe710
font_02_sfnt_off00016a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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