Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5337022969a1164…

MALICIOUS

PDF

75.6 KB Created: 2021-09-23 17:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a295fe6c316072d039fcda825dd234d4 SHA-1: abfd429c1057027bdf2c78828070a96a80e018c9 SHA-256: a5337022969a11641e2b4d159f4461a7cccd1f5ef17a17fb1377fb95b88c367c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and external URIs pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147e4378feb7---tuvomelefit.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4aa760dac---vaxaxajezegogimila.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/b4fc1iu9rrgco04pus9a1jhlkt/65968259897.pdf
    • https://by-express.com/upfiles/editor/files/taxabuzelodepedonulifaga.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dilaner.pdf
    • https://sssmri.com/ckfinder/userfiles/files/4387801274.pdf
    • https://kstraders.com/userfiles/file/sogunaleferivikuziv.pdf
    • https://dacinsara.ro/fckfiles/file/masapalewerusag.pdf
    • http://chonburi33.com/userfiles/file/falinekofopimivaw.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613551904ee79---65650606184.pdf
    • http://uptownherndon.com/uploads/files/66455908769.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/rimazujir.pdf
    • https://kimcert.org/E/file/13872636791.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/refuveg.pdf
    • https://jobtiara.com/files/files/7763806611.pdf
    • http://rollfactorytogo.com/uploads/files/tifejegetulodo.pdf
    • http://pincodehub.in/userfiles/file/16628905769.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/29472782096.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a119c5740---41227756867.pdf
    • https://webmedcentralplus.com/userfiles/file/favanodotumimaxonolo.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/dowutotipanab.pdf
    • http://stl-hk.net/userfiles/25403431291.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ludo+hack+version+download
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/41527196831.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_off0000c2b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 16792 bytes
font_01_sfnt_off0000dacc.bin
758b5987ddd1a0897ab7f2ef0577baf8eb0652cd530d1b241acf7f05e6bb51fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10672 bytes
font_02_sfnt_off0000f33c.bin
0e13f7527a13383148585f3c79c7b16c6d6e96a73ee8c1e6ea7a81e2f3541417
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 17732 bytes