Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc52dc46df94cd0…

MALICIOUS

PDF

110.0 KB Created: 2021-08-26 09:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62d8220a35072d8a7cb3c8823d064114 SHA-1: f9885384da2b613e41e0a7fe6a2ea51e3ee73570 SHA-256: ecc52dc46df94cd081ed025f104094b25b2bea888a9e50e61eb888e7ced59df0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which are identified as disposable hosting or compromised CMS upload directories. This suggests the document is designed to redirect users to malicious content, likely phishing or malware downloads, under the guise of legitimate-looking links. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dorp.pl/userfiles/files/69592932453.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb2c38a303---13939389988.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/36048580654.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65010bfd8e98dcdba75ec75525304389/vorudumureriw.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/botuvu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/ramoponesulirojozorejofat.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c52612687---wezinexadobudela.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b9145f9a---tumoxevesajuwinuri.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32889814934.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/47102708078.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2f40b96f---veboxamima.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5af8545f7---naramidisitulaxavijuguw.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b8kp9k30ltu1655hbkvm60tl9o/10451608069.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/kemetod.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bcb97753c474ca0484f157116023f71d/47575925834.pdfIn PDF document text
    • http://hncastlecable.com/d/files/nalepepusakagerabe.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/40860019405.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/23dc28da04266caa6a33462d04eb58e3/reralewumefobomix.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/29480893270.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c9d481db---zobesajeg.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a131083baea---ruludepeb.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/7fceeu7ummuu0urbqrnj1lvbdl/wumugogikulesavip.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/48695878571.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e45ac47f978---surilamesoruzexide.pdfIn PDF document text
    • https://aokman-drive.com/d/files/tifejurivubukep.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/88469102769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+mo+creatures+horse+breeding+guidePDF 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_off00014ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000162da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DA 11108 bytes
SHA-256: 924e064d9707a65f7b097a80e6156e7c05babe90e084fddd6ebf8bb34b08feda
font_02_sfnt_off00017c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5B 17316 bytes
SHA-256: 24ff14343dc1c2c3ab072f091560ecc6364a8d0788a53134b52633f84190696f