Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed2546eafe6682e…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 17:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d802438a2c607328dfcd2414f6e41d74 SHA-1: 73bb4b3056bc7efb9db91b67d1e96e3b625f4f56 SHA-256: 1ed2546eafe6682e3448d6af22c28843369fd63bfb0118bacc2e44e447073db9
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to files hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to distribute or obscure malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4691b987---1528236027.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/gabiwutupozapesija.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/80831258112.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tokakizatetusufi.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/23190242555.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/81155400327.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/54961470151.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/62552560088.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604f450c38---25914905890.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97c8a948---nazaduwujaboromev.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3f8671d4---30165242821.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/fuvasajozus.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4991be47844f9b84155589a8d19f1304/kisurupe.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bf27252ae1c4ddfa122a0621de4d3ad0/tugemilowonifemokevum.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/kizosavunu.pdfIn PDF document text
    • https://posh.hr/files/migaxakuki.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b19c4c7a32357028d2c0e98475a2978a/zobudiviwanux.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/56785452381.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/zotizojipenexusulore.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexed.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/o5j9ho81a6iha0tsmti1k22lhd/43691559468.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2db0c426---70982385652.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca144f0ed.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/nebiselipatugutorusetami.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/mefulubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=genetec+security+center+5.3+user+manualPDF 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_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10896 bytes
SHA-256: b3fae2d6fb21d3dc8e7c78e75b6a0cb2aa083a76d9db267d84829f300922fb1b
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 17148 bytes
SHA-256: 5f7d0c371f2166e184fe17bbfd5bdbf42f76ccd97a1af5cb74d5d0b2c6b2fe0c
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1