Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a94fb121e87095…

MALICIOUS

PDF

91.3 KB Created: 2021-07-20 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b969e29fb2f9dd09ed1311ea15b9705 SHA-1: 3bf46d6c58a993e878e746ce3dfe6934361dc1b5 SHA-256: 61a94fb121e87095bf6eeadfaa03f5844b66803798025c5e15a22709b08dcb51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this, as these often lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/fuvofokafojelogigo.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/624df972e4126365e5ef0133952e5011/21221905412.pdfIn PDF document text
    • http://pinxedien.net/upload/files/65010083911.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/62092476231.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/m2mdchlnq1if3pkg4aiqdu8tj3/sutizejizof.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea61a905c916c1e4506368138b620005/fopekitopuwufajegejof.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5c07ee49---ratosasapexezanuronesab.pdfIn PDF document text
    • https://ksuskalology.com/images/file/95610153474.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf13ef10f5c---14006274512.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f25c7d6a7---zesijezixowawugokemuj.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/t9n3a6kc3o3im2e3lipf4tmkq7/35541714674.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ba792b37cc5---14897092772.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/92490681404.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n86i355v8jep2eah9e804ao2ek/punibazij.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/20469791843.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e14c6d0f6---51317439458.pdfIn PDF document text
    • http://specimport.by/files/files/56401023529.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c354550dda5---jotamojojala.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/jjq3ug5j09n6dl6i67n4pjcsj3/norubufapuda.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/webogukulefarafenor.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16230205838863.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/wemawaxinunifubimugomez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=two+hundred+and+fifty+thousandPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16152 bytes
SHA-256: a296b1387adcec6f3b2576628ea92b3d2a56d809f0e877613436961f86b2f7ca
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 28300 bytes
SHA-256: 3d88a7605e584890cab41928cd75bf60ddbd0b370ef74baf0a37d1034f7dc574
font_03_sfnt_off00014703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14703 10668 bytes
SHA-256: cbc432f18c5ce7f7217867007156baa038792a04ab3c4b21bdb475b46280cf2b

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