Malicious PDF — malware analysis report

Static analysis result for SHA-256 a334728b0e9e9ed3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 20:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a05b0819acca119b33a13859d9d9bf8 SHA-1: 50e8502f5bfccab688b5e7418c6b653e6ad1cbc3 SHA-256: a334728b0e9e9ed3ab4c5b40ccd0501f7149f59f7593ff1086189708128b55f0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of multiple PDF link farm heuristics suggests an attempt to manipulate search engine rankings or distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bbpartner.cz/userfiles/file/22557498288.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cd652f12cd80a1c349f6dc2e375a737b/lezosebajodinosidodoku.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0rmlv2phehp691fg7j4iend8l7/sixada.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c114b21c2692fb583313f883a7e9e57e/negakawi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210830223253090.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/842s56jr994mqsedokq9ro2g8s/zefefonawowerowajipime.pdfIn PDF document text
    • http://quaint-house.com/lazemumewuvagu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7q7ait4ebuf6g55qvo66ra6erk/burovubanusujive.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/99942294199.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/wutezekegusezudapunopogo.pdfIn PDF document text
    • http://swotaweb.org/img/upload/file/86056126643.pdfIn PDF document text
    • http://zatacorp.com/upload/files/77546717756.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a1793a78f9078b3cf7a15d560c141066/gonetazagiwewu.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/latepimalaneperi.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/50867735529.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/39044eb7780a931a61b1589afc2e4d90/wukaxov.pdfIn PDF document text
    • http://www.pvvc.cz/files/56668026534.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximeturesedam.pdfIn PDF document text
    • http://beiks.info/public/file/pakoxipimazasonojo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa8b41276---65839485881.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/97913500445.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626645895.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161312fadd40c6---36782902498.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6d73a933f6dc7d3b6ef24625fd7b4c3c/jesujerupobariwibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+convert+scanned+pdf+to+word+freePDF 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_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 17452 bytes
SHA-256: ddf307821f48104d4bea69ecece7ee939e80497ed49b766a2d8113f297d3fdd1
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10620 bytes
SHA-256: ea3e272454744001272f037e0f519bd1ad80b9790cd606225a4c24391b479b07
font_02_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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