Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9000f1ef684faa6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 23:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 01ffce99005321b10be30724f75d9c26 SHA-1: 92c3a2553cdff06984d11cfcbaeecb2ae94d8ada SHA-256: a9000f1ef684faa662864b6baf69991081f1ba0a4959a1b3d48f04ffb0432f2a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chemsdano.com/upload/files/79314324032.pdf In PDF document text
    • http://www.amedna.com/userfiles/files/36991763282.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161452959a0ded---34605225901.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdc324c82---pisawi.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/67650924406.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/34263067124.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/44007274934.pdfIn PDF document text
    • https://mcsfood.com/images/file/fafujima.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ee7b8bf23a67ca0d71fe173ba8f2aea9/zipiremekidowa.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/jefox.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/62572208388.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/kejifuvoxigojususomo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/en7lle9u953ufabdagkb39g9c7/ninasenafalovidaregalit.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/54793298306.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/bagep.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/88554227962.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f13daafc8---jifuroxijonixaj.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/28865030845.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/34168334616.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614919517bb9d---84345327278.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/72dvgluesh8v5b228ukgrtcjr3/wuxawesezomowivibunifigi.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/vedulasupe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d8a45604683ba56f6cc2bbebc178ce2b/88159628437.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0076b0180eeadf5d6dc878cb69ccc476/57503252163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=omnisphere+2+vst+crackPDF 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_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 16336 bytes
SHA-256: 57ea73cdd75502ab1d81862c8378de45f170dafeaeb32e0c73e509d960bef776
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 10776 bytes
SHA-256: 4dc49728d25e23ca9714382a1fc757f77d493a6b7e63c8f3293690c270cc0eca
font_02_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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