Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad8af67e89d4154…

MALICIOUS

PDF

83.3 KB Created: 2021-08-11 18:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f1849d010ba4fbf002fd469b768f6eb SHA-1: 84fd1098478deff368cd9bace916c0287f9c2a02 SHA-256: 6ad8af67e89d41549a2665a6a8515d739c701145aee761f5c03af867bc1a38e3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs associated with compromised CMS uploads reinforces the phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f664563dfc---sokabilux.pdf In PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/dubumavasupefowegerat.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/t8838di1ugd8bfple8a18gi8di/90036192323.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/89221522027.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/483535092763a8290dd1cba7382b52e8/rilivaxogamiraf.pdfIn PDF document text
    • http://rykatd.com/files/14567756500.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mvnia8mo403gf0jlk2o1f8ejt5/95265081850.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vsopr7kipjioa0hk5stdv1ahh7/gimimeme.pdfIn PDF document text
    • https://ivanamihic.com//files/16094770575.pdfIn PDF document text
    • https://adikketiga.com/contents//files/31007571193.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210808_A4F6F6E7F50363F6.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20242bb362---fudovodemotofanaj.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dab29a2c7---48510301196.pdfIn PDF document text
    • https://focaccellini.it/file/rotevezirel.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/80000590122.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e67da6260e---bifiw.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/waforofojizosudatawivo.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/64647905876.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/beteniwo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/jigozaza.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/91814589531.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8395b080cd---63221426932.pdfIn PDF document text
    • http://zubrcup.by/files/files/levezazikege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=powerdirector+pro+apk+no+watermark+download+for+pcPDF 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_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 17240 bytes
SHA-256: 7d534d1b0178d52513ed6f65cf49c95482b577046573e44ee8549f7b2552f9d4
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 10792 bytes
SHA-256: 1fc42cea1436ca8f962b15e59477715068ce653b3e63e9c044b99950c65b3883
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1