Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0543ac358d12780…

MALICIOUS

PDF

102.7 KB Created: 2021-07-19 13:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d64d78426ed39676e912f87bce3dffc8 SHA-1: 67b1d94c133e4c6e1483ac6048c10f49e6c93cde SHA-256: d0543ac358d127808d13d5d34667fcc974ad0e35fc393a3741d2f4e9849e0d07
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 numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document's structure and numerous external links are consistent with a tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/35101437551.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f957c6275c---25244971679.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec08b99ed---14292075002.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/pakakajimejofuwisi.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/97309232967.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c47a08fe5c22583247ca8662f2d09105/46464393839.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/86720046191.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/45630310674.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/31e187212ef6aaddb1ed0afc9cc471a4/72449142702.pdfIn PDF document text
    • http://shophouse.info/images/files/99906629464.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc20274ad---fowunonamatiwokepef.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/299oss5jgbd7kgb8csshkcvnk4/30030121067.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/56395915279.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62d711d1a---81968853323.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/984t5s56o1vfaj1f7j0013hjq6/dobivuxexitokezatemi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e6a69a6ae27ca67a02270debf77fd72e/tosurakubojo.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/11734026176.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa60478e2---89455855493.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c13f6742670e5cdebb057996f571332/fosugu.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/saxejutixelaletorabevadup.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba7435d1e---6345125805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+breed+is+the+spuds+mackenzie+dogPDF 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_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D2 11300 bytes
SHA-256: 4b37fb60247de8b054698649688d8f74dace93f7d1eebf6f351068f5f177ebf8
font_02_sfnt_off00015fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD7 17680 bytes
SHA-256: 62956ddec8c8dc2f96a3e51271375c4e6dcd301f9cf444ea749a90d0deb01206

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