Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5410dd998feb92a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 22:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bc681104b1ccd80757bd2b1189b3ccf SHA-1: 1821964ad731a45cb7c11549e66e9842671fa0b7 SHA-256: a5410dd998feb92a751d41ecc751169841295548d5a70de27cd6dea1f550e70f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of external links, many pointing to domains flagged as disposable hosting or potentially compromised CMS uploads. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure suggests a link farm designed to redirect users, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://albertopizzetti.it/userfiles/files/10352411406.pdf
    • https://produse-zilan.ro/files/gexegafalupibamax.pdf
    • https://grandhotelushba.com/userfiles/file/vefewubotijadupewaf.pdf
    • http://alituncer.net/userfiles/file/ririkugurinevigop.pdf
    • https://basisangka.com/contents/files/xowereporubadazisukak.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146225501790---90343648787.pdf
    • http://generaltubi.com/container/ckfiles/files/zerolugojilexowibunagoda.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/870bd8cc06429e6ea60385c969a73200/limanemoxuvufalowuf.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/15241159659.pdf
    • https://buyafranchise.org/files/files/74730007016.pdf
    • http://houstontca.org/Content/uploads/files/24830051065.pdf
    • https://fertilizerproductionprocess.com/d/files/xitik.pdf
    • https://elemental-ia.com/userfiles/file/tigewisijudojunuvofeke.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bojarajipenirod.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/tipuvowekexeponunipuse.pdf
    • http://perles-del-beya.com/userfiles/file/tepapovanifafega.pdf
    • https://ce-mi.pl/uploads/userfiles/files/mogudul.pdf
    • http://potya.com/9388889553.pdf
    • http://maroba-zirndorf.de/file/kifaderuxelawevakam.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613010aa94fe5---20102800128.pdf
    • http://metabolitplus.ru/files/file/jijem.pdf
    • https://condominiovillage.com/userfiles/file/rubapines.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145eef3639c3---52655667007.pdf
    • http://xfswchem.com/upload/files/84250995205.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dslr+control+app
    • 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_off0000cc14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 16792 bytes
font_01_sfnt_off0000e42b.bin
642cf9d5afed5cbefaed9325d73f2f560a9857489855af05c95aba331354656d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 10144 bytes
font_02_sfnt_off0000fafe.bin
cfe5d7714045a15ba88442903e401a8f8c61866b8324688e7dbf0052cb11eed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 17668 bytes

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