Malicious PDF — malware analysis report

Static analysis result for SHA-256 8344c3c1c5535824…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 15:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da7d19b8331fc4f226c6df7f68fbc54a SHA-1: 55f7bc7b23324e0f15bbab188ba7311527ce81b2 SHA-256: 8344c3c1c553582484f88d323dccfc5d2c7d1870416d93876797f376f1f04cf1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, suggesting an attempt to obscure the final destination and potentially distribute malware or conduct phishing. The embedded JavaScript likely facilitates the redirection or execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://poganyvolgyi.hu/userfiles/file/wodopojajugagobojubikanix.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613101f8cdf42---80973329947.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/31960803739.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7b86346e---bibuwexewomewesifiwatuka.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/38758124650.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/pisoxapezelod.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/gezotaxatuwok.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/pusatigawejo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090622554173499.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/62488160050.pdfIn PDF document text
    • http://klemanpince.hu/files/file/25435979915.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kofinipigap.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395cef044e1---24377075142.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dasuvedidejojevaf.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jri5k5cveeuidt0smnm09o37o3/japogef.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/jatasegutaxaf.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/92702591314.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/vijepeboven.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/visovazidet.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/ruvaluvezenatowesimef.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/mijabuxamoze.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210908_032540.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/24311393833.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/36097425413.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lunebefiledo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/129056012b57e06506f23d4a7ebf1439/dajodurivezozekater.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=alex+rider+undercover+pdfPDF 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_off0000be56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE56 16648 bytes
SHA-256: 0d00eaefd41c110032b976766321758db05b2d2c247c2b22d0f92264f435bef7
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10436 bytes
SHA-256: db11cabb6794e89d51c3648ee95c9337f32b061b8df50300df65b7eae94e08b9
font_02_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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