Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a597b3be9ad0f0b…

MALICIOUS

PDF

92.6 KB Created: 2021-06-29 10:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be2bd01bf0c1a31377dc62dbd28a5386 SHA-1: df5cf13c631a5409404beed3582b49d34176dc02 SHA-256: 4a597b3be9ad0f0b6a55c68d1f9e6176f48dfb4990c890a6898c705236ef1ec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations. The embedded URLs, such as http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/597dce10ca9e2b82af5a17d8d59e05df/xiforudofesiwamazib.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d862ba5c99135bb7b7ff2b31a1603a1e/24441973936.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/de9c370388f501289f39c38f779907d3/5679617387.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31703467b---69408343154.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b730d43c325---magefavanowabom.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2525e042---panajomimuwelakikimokig.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/597dce10ca9e2b82af5a17d8d59e05df/xiforudofesiwamazib.pdf
    • http://asustainable.com/global/file/posapokowadikimopuzemasa.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cb9511029c152cfc847136ca62d291f9/bawonidiwuvevomimezigo.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37aab5b2d---2013576755.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/249oqomlp3p792egu4l7thgu5i/71142653328.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fc142464968789202ff7a21285dc4d74/24452785317.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f040ec2b---bokupoxofavewisetirubitet.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8e8c737e22cd56992fc215d03450d792/10354668854.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba581c67b---87060695014.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/41854109591.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcea4f1572---xoxukowimubelogerunixedas.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/pabifojedavedasozabokiz.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/43814098510.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d15d423831d79c3193a787fe8683872d/dobovedajag.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea70be9a39---pesunerevokidusifope.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/029ddbe4f3b02bd64d4b762401862927/49859731517.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73ef382f7---23939772089.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f535211e5988e80343970b3cd74dceb8/dorisopem.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6f1f815432cf46a5a591a1f52ca45d9f/wabufaguxusokaxizapuz.pdf
    • http://massimomoroni.it/userfiles/files/15852898017.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=shadow+fight+2+hack+coins
    • 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_off0000f837.bin
5739dea62ca38eb763f43e62c38d1a233ce007de7f1802ccaf82b8fe3850341d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 29808 bytes
font_01_sfnt_off00013235.bin
6136689803ca50ade14df63a4d9e776b9e061e98cafb2a27b807c0180ab80da8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 10848 bytes
font_02_sfnt_off00014b22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B22 16792 bytes