Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea73218cf108041…

MALICIOUS

PDF

78.6 KB Created: 2021-08-05 06:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57755a8c1c0af49d40627d455c4efe16 SHA-1: 358c7e7fbd8fe343798a9a03f1e03f7f1ed6332b SHA-256: 9ea73218cf108041a107665f07b801dc9bd4953949b6da7eccfaaaef2fdba04e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to leverage these links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://itacademyindia.com/ckfinder/userfiles/files/47122026820.pdf In PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/rasudilijuli.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d1f69aa96fc3f1ab8ac9c3789f13731f/80075662466.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c892b3ba---kawofawizedovutiluwafi.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/7689577442.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/1811602678.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/sefoxesuvepobur.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/dudoxutenuvugi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160837a0be28ca---fewopudusixopukefovusu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/97237099928.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sarikekemurufet.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1dda6a82---rebinosumamavuwe.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/82275c20ebfa6c8386635395b3b9f9ae/12762811358.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kiwoxibagi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/dinadonimigujegama.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610808a800652---topuzupubulaja.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/57805708114.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a547d8c798ec298bcdcb3c1505d5b557/xufijuxixatapuvajubev.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/12722913446.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/lesaxo.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/15760923315.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b82d0b825---49611865481.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jujigisuwurikupokedipu.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/66212707168.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/28783823511.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c871e85b644---64478020785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=addition+and+subtraction+of+monomials+worksheet+pdfPDF 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_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 16556 bytes
SHA-256: 6e972b5def7cbb41f51bf4d37a41a254bc65085a515677e4684c466edeaeafa6
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 11284 bytes
SHA-256: b8d334ea05b82d2d497fcbd589adedbfc3b30f48c0004495e6667ad5cf4ae233

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