Malicious PDF — malware analysis report

Static analysis result for SHA-256 0103efab2f37cc97…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 08:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f5b5ff00f16eef3a213f722687a8dd3 SHA-1: 9dbeb3f14b12a4119c8b7ebffe987d1f69c459c7 SHA-256: 0103efab2f37cc97c1ffbfe1b5df834007cb72cf385d6828d4ee3d320c48b4a5
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, several of which appear to be compromised CMS upload directories. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a link farm suggests an attempt to redirect users to malicious or deceptive content, potentially for SEO manipulation or to host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tasarimak.net/ckfinder/userfiles/files/wimujepezutewu.pdf
    • http://trunghungplastic.com/luutru/files/gugekujuzemat.pdf
    • https://cesiedizioni.com/userfiles/file/76023995995.pdf
    • http://caythuocnam.org/images/files/2248118539.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d2866542---besomonibewumotazikudib.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091da61ba364---42868122296.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/dopowibilofanix.pdf
    • http://mebelhotel.ru/images/news/file/gasipemulobi.pdf
    • https://ubranni.com/uploader/files/79180643243.pdf
    • http://chromowane.com/userfiles/file/vetosokusokon.pdf
    • http://hotelniagararimini.eu/userfiles/files/63516792045.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94d091248---28004303230.pdf
    • http://luchetti.it/userfiles/files/98752019524.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0d921cc3c7e1a30533b146b5a0570b7b/56428919974.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/34d29d74afe83a96adfb61c7b52deed7/7523460266.pdf
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/bemarerul.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/46983ebfa606596465b2098b9e20c5b7/8412170647.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/77391028425.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021072004064380554.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd7dec4643---25815491239.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/miligoxeji.pdf
    • https://sgcaregiver.org/contents/files/favijegomuxikijurow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pertumbuhan+dan+perkembangan+tumbuhan+kelas+12+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2cc.bin
267f2d32a13ded03746955ad90bfe95f51e4924d01931ace39f0134c6102be80
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 16872 bytes
font_01_sfnt_off0000fecd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16792 bytes
font_02_sfnt_off000116e4.bin
7f95ccf07cf03fa21b7c6bd3d09186d163ef5b8911524f25334bb4f6f7a78c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 11236 bytes