Malicious PDF — malware analysis report

Static analysis result for SHA-256 4738b579470feb50…

MALICIOUS

PDF

120.7 KB Created: 2021-09-06 14:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d532d0568ef15845ffaf806a8c75ad6 SHA-1: f2e9f0c35bcb100bc419e9b46b76a8dbaa7fb20f SHA-256: 4738b579470feb5055c2e5f642252d75304bb9c29083681a57938cd458ff0884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/t5gr3vmo95al5hurge6du1vim5/3659569.pdf
    • https://protrialse.eu/files/files/30354005527.pdf
    • https://perfecthospitals.org/FCKeditor/file/junofixofapokuxexote.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8h15vct98vn871h4o8rdt0c2oa/85598515502.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/rudawodenotujofojumixumon.pdf
    • http://www.findvoters.com/userfiles/file/derazosedikovomikuwu.pdf
    • http://ehoron21.mn/uploads/files/71348188894.pdf
    • http://cnpair.com/userfiles/file/24274116707.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aea0e8b3e1---mufojivedezajepumexegumi.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/rilizegofagapowitabodij.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5ukfj4k776lh1m3a5ckooqqq82/94420129968.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/b511d921506db3b4bb4fe1ee904bd804/razitalabakifawabebemibaf.pdf
    • http://qlinairnv.be/userfiles/file/norap.pdf
    • https://unique-u.biz/images/uploads/file/zowapoxemis.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/44167367641.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889d46dcb---54104258931.pdf
    • https://growyourmoney.in/userfiles/files/4633352546.pdf
    • http://kompletucetnictvi.cz/files/file/tujaga.pdf
    • http://xinyuemu.net/assets/202108/files/20210811235125757999.pdf
    • http://fujavietnam.com/images/Download/nifalarejuzelumojugi.pdf
    • http://mijn-nederland.nl/userfiles/file/75289553797.pdf
    • http://pactolous.hu/upload/file/37618357944.pdf
    • https://eetravel.net/file/82246805981.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/jopaniwatafidap.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53dc629ae---93786205244.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=scrum+definicion+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_off00017507.bin
f10db08e472dc9ab48d972080d2cfa61d778b7315410300c19e2fee1c7850cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x17507 10484 bytes
font_01_sfnt_off00018cc7.bin
68c0e339bc09070f0330fd5465bf566303091b3f41aee0a03bd143f52a99e4ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC7 18436 bytes
font_02_sfnt_off0001bce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCE1 16792 bytes