Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d66dbd32b20c7c…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 16:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c23b2ce860f65eff21087e9dd74302a8 SHA-1: 73a9a1d2394b93ec3b6d4446a0438398416dfb0a SHA-256: d5d66dbd32b20c7cc35592a2fa61333f8e894eee9052ae6d600f264f033330c1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or raw IP addresses, suggesting it's part of a link farm designed to distribute further payloads or conduct phishing. The embedded JavaScript likely facilitates the download or execution of a second-stage malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=knowledgeable+books+to+read+pdf+download
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c03411535---16079518516.pdf
    • https://nutricount.cz/UserFiles/File/kipaweb.pdf
    • http://unleadedcoffee.cz/soubory/gajikujonopewage.pdf
    • https://atlaskvartir.ua/data/uploads/files/duzejuxo.pdf
    • http://hugslock.com/app/webroot/img/files/zimirilavoraputewitukaw.pdf
    • http://tscyw.net/userfiles/file/20210717183234_etr0p6.pdf
    • http://hiddenroots.org/clients/19739/File/moduvumuwenunoxalugesob.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbb650412---39786451212.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e5f765e0---33413125815.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/jijetexivum.pdf
    • http://h1t-urlaurora1-turbo.com/contents/files/dukofevib.pdf
    • http://phamtrangia.com/upload/files/91202199498.pdf
    • http://phantasos.org/userfiles/file/gurupufuresivaxunejusu.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0a9b53eff---jofetetirop.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/petalowugaxosanejuka.pdf
    • http://orem.mn/uploads/files/18244849111.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vfgqdjf0psitfvtudqi0bli13v/78039436163.pdf
    • http://anvlaw.com/userfiles/file/xiladejoxigolaxu.pdf
    • http://babamoleskine.com/files/file/95595379036.pdf
    • http://iccarrentals.com/files/file/82051537255.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/8b51272b76d613a0429c8fd5b49d9a7e/91591648020.pdf
    • http://48bulls.com/js/upload/files/61540391846.pdf
    • http://stalmont.eu/userfiles/file/53436807852.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/94789b0f3d4e5575d54f490deef018dd/bixaxetalefuzuzim.pdf
    • http://alhouti.com/userfiles/file/xalujoxawuziroxopizuwusoz.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b95dbc5ee7bbc10a3c719feb21a24853/bemowidunewewiv.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_off0000ede7.bin
caaa53a6622c49f69e0eedb3dbcbcf1132290f4a443caffd77a23461daa6f41f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10892 bytes
font_01_sfnt_off000106e4.bin
62ca5711a5fe6d88f70b5d187a2fb48efdde88401f856b63d0f219a653506dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 18196 bytes
font_02_sfnt_off00013670.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 16792 bytes

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