Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa158651b5575b9…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 09:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53f1e55453446a0535c78f0357d562a0 SHA-1: e8facec8225dfb1c02bcd74936da8f83e5ab4ee7 SHA-256: aaa158651b5575b946bd67b333635823e9f3783b9be92c483c15888418a1ba77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://pistant.ru/uplcv?utm_term=open+me+carefully+ebook PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161360a91f1df3---60744727195.pdfIn PDF document text
    • http://newworldss.com/uploads/file/savasizamedivoxoxet.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/senulenikopamogojorawi.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/77801384464.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rakevolulisit.pdfIn PDF document text
    • http://cke.hk/userfiles/wanawu.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/42055359639.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b49fc58992---pezijapub.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/bemunudonefifusuv.pdfIn PDF document text
    • http://gns3.swiz.eu/files/editor/82850558420.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/wumexenobuduvadebitamu.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/jixisitewoxi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q35h25btfsbd7rgv2b2qagr7e2/tixitinakagirogitagoju.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3tnlhrk79h8oesd9qbp65slod1/sanipafuzukuzorufipunem.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/niwifovavamif.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/20072790727.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/liwopenomuderafu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/33064125687.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/81587142147.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lufisenakivudukat.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/49100855970.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zafozomuxugaxawafawaj.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/35095257222.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/aa973e350f03fba9f12b0dd68ae0df7d/wugebivutobibawivomixa.pdfIn PDF document text
    • 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_off0000b3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 15916 bytes
SHA-256: 0f2d36a7338150d57ec61aa114fd1534d81a738ad8767da21fcf934f2117ba07
font_01_sfnt_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 10752 bytes
SHA-256: 8fb3695c1fccb2d7f5bef5108125959cdd3ba7954ededb21deaeac615fa9eb14
font_02_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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