Malicious PDF — malware analysis report

Static analysis result for SHA-256 474e2a2d75533d14…

MALICIOUS

PDF

110.9 KB Created: 2021-06-27 15:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7469169b6948993899d631f562919785 SHA-1: 9257d4494c6e1e222babeb39f7a59f7bc80bbb7c SHA-256: 474e2a2d75533d1428108f961cf9424b1027172b76aa51ee8a049b7bea93f496
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to compromised websites, many of which are hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to direct users to potentially harmful content. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0619af08da---jugejivabanobekupid.pdf In PDF document text
    • http://mobilesamara.com/img/files/file/lodebewowuwozisamigibudat.pdfIn PDF document text
    • http://prestopc.it/upload/file/74934997929.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d604e3c8---wuruwabedazumipudox.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16071812c0f46a---44049102562.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa4eb217e---74473421532.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84ac4362e---35921605683.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/92q3aqlh1c0fdoemgiu39np3uf/jigofofud.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ea4f3b80---memixog.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79758513e---bavenapofomulimow.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/72932290993.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/8933316967.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/64506496866.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/sukabuvipozekovanarofesol.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wotawuratajenatejun.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d38d9131665---59942904261.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076943771f07---97461249722.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/pexonekulamebesiz.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///9210826102.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fe85eff45456cc1e38adda47b3a3578/81395757035.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/dokunukozubevale.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/getodiwexaxewakezimomop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+house+on+mango+street+chapter+1PDF 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_off00014c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9D 10796 bytes
SHA-256: 13f660b4cf843c14b16c4d2c0311c834e35a9d55c1fc86de2373b6d0a16bcd06
font_01_sfnt_off00016563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16563 18428 bytes
SHA-256: 2b0560bc86531ab7b95c0a60cb9a4d7f646e88a45bc285c63f5686c84871d09e
font_02_sfnt_off00019486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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