Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a289c9e86b8996c…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 00:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3e6c6a56573520dbec3e7b6020b108b SHA-1: 038265f5771423abe0ecbb7f40edec5160bf72f3 SHA-256: 4a289c9e86b8996c88b5db8846259f3a4d1978117fe98ceeadf02ed812f946b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into downloading or interacting with the provided links, likely for financial fraud. No scripts were extracted, but the presence of numerous URLs on compromised infrastructure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/im6k8be4d1kk2beejj39n8ked1/losifukopadebisilogena.pdf
    • https://chmelo.hu/sites/default/files/file/xusejadetobefepibup.pdf
    • http://fresh-j.info/images/uploadedimages/file/15369062922.pdf
    • https://bestcoloringpages.com/userfiles/file/87494533796.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7a2e3c8443c8cf6784c597ec40e14277/51413232529.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5ee045a9---66514314095.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffde153a6---85726381342.pdf
    • http://musicpark-live.de/userfiles/file/fibesanepoxov.pdf
    • https://machnhaduong.com/images/uploads/files/65843214096.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f4a5c4a72b5e03621b13844a77b77e4c/18166507352.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e89e5f14caaf593896aa038979ee2bf5/tivawa.pdf
    • http://bluecars.pl/userfiles/file/2643951565.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hs00ggq6nt5j60ofa16j2mg2sc/webodinutamosekaxomepomut.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f3f37d8b1752f1e1ae1bc7c7b0cd5b03/seruduxisimik.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/domexop.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/74021666275.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e067e644---60153531473.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ef2641d1f80239055ce8f99cb709f8df/gaxawimedokuzuzomimudi.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2023949c---32402693428.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e5faf39aea83dae1fdb2a627f4d23fac/30666450603.pdf
    • http://nsdadventist.org/FCKData/file/vebagebaxivugogukebada.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a024b49b08---sifolaviladanumunebize.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49b8eb1d3---35511790974.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ssqtdv2il7bqb58voek73e9r0d/zalevarupupanojafe.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/d42k6ti78bv70eb92j1m2fanai/38128787138.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c73303d6645d7e59b81a5d01157c6c04/93101972070.pdf
    • http://donateagift.eu/userfiles/file/47678993719.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/xiwimakevujazebotesin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=purchase+request+purchase+order
    • 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_off0000eeb1.bin
bf76dd651db3b4a666a2e31db2bbec7c4b913690d1c9cb2a049a1c902e7889a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10616 bytes
font_01_sfnt_off000106e8.bin
1777b9f9c97daebf6e39e18d0547901a5d3c7fb14f6145cc3ef5e34a2ae6e329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 16492 bytes
font_02_sfnt_off000131c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16792 bytes

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