Malicious PDF — malware analysis report

Static analysis result for SHA-256 f202e1ef90d0703f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 01:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 662e16756697c9c7f8443fadd08b9610 SHA-1: 078abc0dc6d40b7873a4da5c24f62dfb3b6fd6fa SHA-256: f202e1ef90d0703f72fb2c17b4904ef858a6ab87cbef9419a98a16ca62029d93
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the pattern of using SEO-optimized links for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://jooli.ru/ckfinder/userfiles/files/melure.pdf In PDF document text
    • https://livnica-metalurg.com/images/pages/file/45834091477.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/75425057103.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910193017198.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef12fe55bb---19218064053.pdfIn PDF document text
    • http://cpviettin.com/upload/files/61365521207.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/77741767030.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613113c1bdf8d---65530765243.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912070650.pdfIn PDF document text
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/zafajuresoluvivam.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gebazujukirif.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/xorapixemer.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/xovare.pdfIn PDF document text
    • http://domosplast.hu/files/file/monofikatulasubavusowo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/mutabegusoporetinokuriwo.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/2445956077.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/q8j5lo38kk9ddoble479uqbu5r/xedazugawilap.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/85335970252.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/fomiletizibufajanagovuz.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/32244910678.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ec38fd6f76dfac69fe84c489f48827d3/95497562340.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/79113201667.pdfIn PDF document text
    • https://asken.as/bilder/file/fosafusakanibinetukoli.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/peparifasukisexadegiwime.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/josuzu.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/savetisonujalivowiwonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=principles+of+marketing+17th+edition+pdf+freePDF 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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 15676 bytes
SHA-256: 4198a620252bd34e3e29720d28bb4f6eaecd341cad2be54ad1e33fe60af9e601
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 11264 bytes
SHA-256: 059f47e58778a0ce0c333cb542ede80d734361aad0203775981e41d623731bf7

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