Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22ec0ba33697e35…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 21:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ab52fbb82b7368cdbbe208a19fe481 SHA-1: 9f63906bb2ce1be06fded2844a589d5acbf80399 SHA-256: b22ec0ba33697e35685df6a8a8b6dd61aa766a31e24b9dc3a3f581bc2beb16c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links form a link farm, with many pointing to compromised WordPress sites or disposable hosting, likely intended to redirect users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://medvor.ru/uplcv?utm_term=biology+sex+linked+traits+worksheet
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb3a51476---17309959625.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/16749416057.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/mijolifevezuvamo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0d79d613---46314233401.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/mojomudisefevolufigivuv.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f95885eed9d4c425db333a938c4c3909/16750188093.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/70671549424.pdf
    • http://vibrator4you.cz/UserFiles/File/guluweweminuwo.pdf
    • http://gapp.fr/medias/files/92947774799.pdf
    • http://fashioneducation.ru/userfiles/file/62350114481.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5e2c3fc28---81512542236.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086615876048---28524060058.pdf
    • https://heatingboiler.ca/fck_upload/file/xazobelukawusoburetile.pdf
    • http://abnicum.com/files/file/34712899917.pdf
    • https://egca.fr/userfiles/file/filuxowibi.pdf
    • https://whiteplacard.com/UserFiles/file/fuwilir.pdf
    • http://theurbanbazzaar.com/userfiles/file/pisizemozolutanitufolevo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6610cf9be---67795016784.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/36380662803.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608886b385252---23595817157.pdf
    • https://aashianarealty.com/file/wisajagalasavijugu.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ac5f8b09bdab9c52b1b5a32a00ef9be7/93902805670.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/79736435543.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/riwekezeg.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098debe20095---66852700655.pdf
    • http://angelescare.com/userfiles/file/kizukawepevovizawape.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/termmbbrq55r35erfjr8ibnnp6/30138215476.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf8f6633f---72525267671.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_off0000cf82.bin
b5191e9757c359a7e75430d2b67abd14e3a8c593edbfa87ae880a6ce6836ba07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 18240 bytes
font_01_sfnt_off0000ff2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 16792 bytes
font_02_sfnt_off00011746.bin
37b145d4233673b2429c9a87e129a2c9f282557d336ff20724d9a399eabbd540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 10972 bytes

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