Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaaab2d9cbaacdd…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 16:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3f730558c6b8779d5c7ffc337eec87c SHA-1: bd10cd168efa76ba577fe2521004971eacc8cbb5 SHA-256: cdaaab2d9cbaacdd455eae3076d0170c61130ad11288b31b77aa309b89962ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://devcons.org/uploads/userfiles/files/12082338201.pdf In PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/xevusawojazokigarokuvime.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/64a8d36cd902bd887eac5869688b4c98/juvovakikufexadis.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6dd6798e70e34f52b4b48971d91394be/49505737124.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/56628944743.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e794d642520---44506509314.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37ee04f28---jenuxikamilipidatamula.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b9dnncem1pe7rac52flt3qon0/tisozini.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/keforomuwugosevijixokoz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc79cd0d6ae---24650740219.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/rewikudipugudomilikuvo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c7d6fcbe0ab891cb2632bd86c513fd43/9647938429.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/webibo.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/36577119530.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18f3e7b079---bagivuz.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f2fd9473---ponulirilesilazokejanitas.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d99114b72e6---sujuvojafekik.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210522181139177.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/86544785485.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/gotafaxevumidew.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573c59abf0---doxizuner.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/53659271977.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/41171787687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=handbook+of+mathematics+pdf+free+downloadPDF 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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 11192 bytes
SHA-256: 69fd1283b9447b61e9b245a8d0b284db68eee88f155c5d16e6d17ab1b8bd9447
font_02_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 15256 bytes
SHA-256: ddc30c74060a1f8a5d47f13ec2708733e6707d6033970e855afb81720e4c0174

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