Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbe8c501ec9e675…

MALICIOUS

PDF

87.1 KB Created: 2021-08-04 00:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29a17a92e75e8caaa78ecf9e4c05d1cf SHA-1: b717fe9f8ee06cd3fea12e93a0e17ca031180044 SHA-256: 7cbe8c501ec9e6756063edd418bb866233f0ecce9195a2f6fee42e2b7c792bb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, but the URL analysis is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://hondaototananlongan.com/upload/files/17175836664.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/75ca5b0ffc2d178f77f53c34239e5a56/dofumarowukuzodovabasipil.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/pitogexi.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/2275409404.pdfIn PDF document text
    • http://slsnn.ru/content/file/57442033300.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5c1f193b13738c133de38ea6e9bbf86d/gulezuvaxogaselutab.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rjfuopq60qjfvdjaqbibrc0km2/dejefuw.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/65802092861.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/94796251815.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ca0or4npmgirtpjfjdusoedv63/99470357822.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7ebde19e---watomesiwos.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/wakodufefi.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/xokadulasoga.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/rirasafidonelipagazuxivi.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/00d84f8e9caba1ce3e7885daa8fa817d/dujakuxokamirumop.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nowujijagarunitetune.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/67390380698.pdfIn PDF document text
    • https://dpmceramiche.it/file/22981499691.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c3598a4f0---3461281165.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/65400e70fec397cd6e4f37cc36cc76a7/visilasol.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ad49d4240fca034a603e15b90a29d609/18305722308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+happens+in+after+we+fell+spoilersPDF 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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16928 bytes
SHA-256: 2c4d632790e25484e0e0122d757bdf952ebeb742a7281a7552f24e1b9ab0fbee
font_01_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 10536 bytes
SHA-256: 94ac57a96a4b381d69d5b823b807e45a920e870689ad10bd73666e5c80d2db40
font_02_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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