Malicious PDF — malware analysis report

Static analysis result for SHA-256 add18e19cace739f…

MALICIOUS

PDF

76.4 KB Created: 2021-08-29 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 482ec7d3b8443c8e3417b8ae485b0490 SHA-1: 837f7b608cc1a5229ae674fbef77cb53818ec7b0 SHA-256: add18e19cace739fc8b5de8184af8016b9345bbf99977c9bd31d35f54d9642bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

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 http://guides2alpes.org/uploads/file/54749478187.pdf In PDF document text
    • https://goldmenu.com/userfiles/file/61697453099.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/68658b555061573ac86c6b6a268a190a/livemixororotugat.pdfIn PDF document text
    • https://valdisieveshopping.it/file/jarotowi.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/ninamegisufazosukopinumov.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/84284508716.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/79422131927.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c72c82a71---situgizuxuma.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/rewudunelaveta.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/figevorudiruje.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05cf2cc05---17463575653.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/49416289922.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084475e7e369---linulobodepar.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/loxogeso.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/85559346020.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b323c684215---kufigoxiparefogazarisa.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/7340416117.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/60053017551.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0dcede0d---7289157970.pdfIn PDF document text
    • http://asustainable.com/global/file/dugevexepegu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/09753e912d60a522c9a534ca852de340/voxefelupunajilol.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/zegeponomaguvi.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/vorerosawunaxovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=i+love+you+yes+i+do+and+i+know+that+you+love+me+toPDF 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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 16452 bytes
SHA-256: 6b115a5bfc9b0f0e1315f076b06609c998681747510c72cecbf8d73dc0de76b0
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 10820 bytes
SHA-256: 3585c510603cfdf61592f8799bba489693091fe44c0b42e72cbac001b60770b2