Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e0a9a8808ccceb…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 21:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 204ec87adb7b8d27a06f6f74b5915cdd SHA-1: f578b4c87823bb24b777e25847e9991fe21b4cc8 SHA-256: e5e0a9a8808cccebc816bba3fbaba29e13dccf58ca6db1dbc98900b085561f2a
156 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the nature of the hosting point towards an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=b2+level+reading+passages+pdf PDF link annotation
    • http://apmnir.ro/fckfiles/file/gopunikatafuwikalatoweme.pdfIn PDF document text
    • http://pedraferro.com/files/files/duraxabuzuxokepewazejejaf.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cc996f95---67989151611.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/58109385839.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/surujeraturudofula.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/wadekopekixujuzutiriwo.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/rofowugajivitemenosu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440133a9d6---67397576109.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/midafuwida.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/76017658353.pdfIn PDF document text
    • https://loyd.rs/images/file/velezorunawerakuli.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109141447093430.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f39d20110---duguvivavonuku.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219512124659.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/36146993818.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424632deba7---23461728936.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/dusulineruwizu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1595f536---zumuvamil.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/jepinenezudod.pdfIn PDF document text
    • http://schokofontaenen.de/idata/rodigun.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/77662002491.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/98883228457.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/66058197989.pdfIn PDF document text
    • 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_off0000b148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 10696 bytes
SHA-256: bac8bb0cb8889980a240d1bbaaf2604f653f5e752f5f493179a7645dd1c3b873
font_01_sfnt_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 14840 bytes
SHA-256: 3d863a1077d6bacc454d96e019563888314151f526656a396b7bbef03a9cef84

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