Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2c8f0a3fc24af7…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 11:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b184e71237a3efc65c7b59ad965ab16e SHA-1: 1e9742bdf96ab35355c4d1a223906389ed3affd0 SHA-256: cd2c8f0a3fc24af714e08e474e32e6e8ec034fe6436123217b4cd34fa336b9ca
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term_redirector=True' further supports the redirection aspect of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8db7d47b541f69fbfd0ffead8e34fd56/98949705410.pdf In PDF document text
    • https://pacantioquia.org/aym_image/files/dekizebununifizo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/zelisogokasilixofokopeb.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/62659581274.pdfIn PDF document text
    • http://sakra.sk/storage/file/lofunuperogezap.pdfIn PDF document text
    • https://proia.bg/userfiles/file/58863989782.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/8834154438.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/vuxuzafewatomejuzerusi.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/juzoxusilenalijo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/menejafebevag.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609480dbb8f93---47671027929.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/41523468862.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/2djtc97jcs6oeag2pahlmnhbai/jivemanesala.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/9rkb4r5aiaoudre92d2gdel6jk/gozugijazusibagifenaz.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/xeruvuvakevidowitozunes.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51ac62a256---95335942108.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36b5a8672---83567001449.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/13cpt3bckmtq3j4kv1bv481vkc/9737574215.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefedibabovededije.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/29730595771.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/bujogul.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/59630d81044077db5f12a0889832fc6d/96228601875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=permanent+trach+tubePDF 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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 20076 bytes
SHA-256: 60f3332caaf00ca819fb2f143ebec081081f33d24ba382a336385175f84233eb
font_01_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 10308 bytes
SHA-256: f506967bbd3b290f60b7ca84c95f3b11353cada9dc73b8343bb04728622a33f6

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