Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7adc863f097342b…

MALICIOUS

PDF

75.8 KB Created: 2021-08-25 11:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce0780ce769f6ead2ed92368b8b4cca3 SHA-1: e0ccc2d567c610e6bfd573feeead66dce618a655 SHA-256: d7adc863f097342b10106f833c66a68863a97c2a84cc95ae074ae56e7022c1a2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware. The presence of numerous distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/usa8tocua79m38ijg6gcq0ohp1/4952255525.pdf In PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gisikobezabupubipave.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/fe6c5479a943fc64eb84485eb1cf2059/27225590127.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cu0ks6h6akmn4kgs3sfer189po/tilowuxokekazozusuvidari.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb776571828---53107163973.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b151b32219---50050960484.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a309e529b1f---30921166041.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087a33183b1b---nenevo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///65992373574.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/fixutarabafax.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7973651801d348e8674a4817ae3f0d20/24337994246.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/baxigeleduro.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/91900310824.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pefotuwejosobakekaviviwa.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/timar.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c12bd1bc---wewuvuja.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/sasiwo.pdfIn PDF document text
    • https://bloomeng.com/uploads/7034881316.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8cc37d3075794f2493dc88e09c33d42b/lurexikezoz.pdfIn PDF document text
    • http://mopron.ru/upload/files/15069404398.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/18552957769.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/61687703549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=base+angles+are+congruentPDF 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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 17164 bytes
SHA-256: 228464fd9af630f93e2506b7e71d8065301cf77d0999d191af4e7cad6a6e31c2
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 10468 bytes
SHA-256: 4b5e9eadd94f193306d513214186b29e414e32ca7021f9547b1702e41edc4502

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