Malicious PDF — malware analysis report

Static analysis result for SHA-256 883caf215f09142a…

MALICIOUS

PDF

92.5 KB Created: 2021-07-24 00:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aa8f858fcb3b3b0ededeb4896fb1fd18 SHA-1: b4b6028d99343a779da1eda8bb83773e48d4c61d SHA-256: 883caf215f09142aaee3278b7d66de19c698c1110dafe24a03851197e16f821f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs and the PDF structure itself are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://titadoorbinhduong.com/upload/files/riwokidunamupazifasudumat.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e04cf523f7c---54052932287.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b831f3e3a7---guravuwufagag.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/wuvimabane.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/2670192542.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/866a4bc6521f72e95c9dac379bc28007/dojewuwefopenedagigusexe.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/xedixez.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/pogomegeposulejimi.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/feladoxumodisu.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/20655891051.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/dosek.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba020bba3---letel.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0ccfdf255f30a97b8503de7daeac4257/dojogumadibexe.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/84819087837.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r6t80vdnntd52oa0sl63vbqogc/98687585481.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/laxofowuruto.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7cd080df7---bevulezorowinibaxe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88b31a195---39523354444.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aee9ebdd3---35322690017.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c6464956---20267303701.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/22f8eb6ac4efaa46b0078dbdfba42535/83408167588.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/afb340d2fadbae8d7a857b6e63237cad/tivigagufenux.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wuwovuposupoxobilobilake.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/37091228355.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf66b3b07e0---baliwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=does+procreate+work+on+android+tabletsPDF 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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 17132 bytes
SHA-256: bd8144116e94fbc9c0a4954bbe1dd10e1aeffcaac2000b6790713796db14a6b5
font_01_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 10828 bytes
SHA-256: 23206df4763f4be9014e1860ea5f418d724bfbeb282c3960a72dcfbba815e328
font_02_sfnt_off00014903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1