Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ce76dcfc022632…

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 07:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a3462e3117f2cfaf5e776580edfc49a SHA-1: b7c61c377937c1278986e567354e0b98a61b3dd9 SHA-256: e2ce76dcfc02263273577e766da7f21097de9f63e6d7fff83addfe265c1b69ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple distinct hosts, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. While no scripts were extracted, the document's structure and URL patterns strongly suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

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 http://krzysztofmalec.pl/gfx/fck/file/96177301645.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/jexaz.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/21196127400.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tmfhhse7dl8dujldiso1u17kta/doroxawokobesusikebeseba.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/rutipepudegaxaxisago.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2fc7c0fa38cffc2478be3ea15e35dd04/27817080156.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/taxaxipijabek.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944880a9507---91496865252.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12352d395b---guguniw.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160955c861aee9---gixemuwo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb5d2d5354---9848602643.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8ca8bb1bae1d35ed231004f43ebe9ef8/17602708906.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2288d7ba---pofadalo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15fd52c2e---26779080343.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46530e8288---zazegenawo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eae5af0cfebe12bffbe2b3f9ba2f869e/gonaji.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/25v5q7c3f11qvr50s1tn7g5aq1/kenosedafo.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/82654256589.pdfIn PDF document text
    • https://digireg.nz/upload/gizosimirumiv.pdfIn PDF document text
    • http://tms-operation.com/upload/files/vuwuruxowija.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/36583892063.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e730adb43a---61099994727.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/dapotabeluji.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075eab33cb7f---19243632841.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/negakusur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fareed+zakaria+in+defense+of+a+liberal+educationPDF 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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 16620 bytes
SHA-256: 6380249d86984a7609cfecbd5be8158fcbf5dc87b1c850857f3ff10ae589a29e
font_01_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 10836 bytes
SHA-256: fd31e426905c20f0e2121840628e357d8d0cacb450229eccf58fe588c5ec9856

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