Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e27c4add839358…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 23:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c56218e2864d82a7125142fd8ee1facc SHA-1: dac3093671f5958475cff6f8da1232777c3f5c50 SHA-256: 95e27c4add839358de3afac5a019910fb7258576ba30c66a68db44f6efad9c9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple PDF link farm heuristics suggests an attempt to obscure the true destination or to leverage SEO poisoning for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ea42ae5f68f637b9a0d1df48d261f745/15135637085.pdf In PDF document text
    • http://hyundai-baoloc.com/luutru/files/varuteporoza.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/46551822538.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/nukijat.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_215202.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/joradigupidivori.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/34046359488.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc8c494e4---pomovugabiroduselugadid.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/85020276711.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/xoxagifakorolup.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/biwekijivukijugolam.pdfIn PDF document text
    • http://vpsystem.com/files/fck/73950322922.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/27426831702.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/gufurikofepixojixuwe.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/kibivunamim.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bakuzubobuwadunewa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387c34d93b1---duwakujazozokelulaxapimet.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/morigituromelifawa.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/41786214537.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///ronutumimipudizij.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/5884577127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=como+sair+da+conta+do+gmail+no+androidPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 20580 bytes
SHA-256: ff3cd9d7d6b76d871986d2328644d097b49a7b7ab2ee23e3241737c0c3e87c08
font_01_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 10612 bytes
SHA-256: a430b5a151f67b470dab08794dc01c9121cc4195f847531b54da47833e33c60a