Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9a0e7167e8c128…

MALICIOUS

PDF

72.7 KB Created: 2021-09-12 13:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b74c0f26c913b44dacce22168d6edd67 SHA-1: be58de45239b73929cc2df887760b16e7ad9a99a SHA-256: 9b9a0e7167e8c12841358c88b6010a5d5eeb396c0e9aed1a3c6ba837e6525584
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://effektfilm.de/files/file/rabunitupilisananomis.pdf In PDF document text
    • http://ndc-group.ru/uploads/files/14833745773.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/bosokat.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/28789822359.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/vulizevofuvemoxu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81505618514.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/gakujanemuvapedotu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bhn1c8v2lgp8ssvrq6oqlq73ka/28473417972.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133002b3ac25---radofokowubutugukubi.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/84584097863.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73623716142.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/91949679346.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/biretedo.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/62907533502.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/8718729466.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3956_20210902035817.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/63244540987.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d7213f69d017bba2c5cda2a790a885b/bopuwibozuvimevubi.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/6326764650.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/fiwamuvovupazedelasiwako.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/mijofixesazegajowi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1a14543fa3fa52a10608db38be44cb20/pomudodezag.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/56758468787.pdfIn PDF document text
    • http://www.polni.si/Images/files/tagumusikegozunufufo.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///76553968299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+dr+driving+apk+modPDF 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_off0000b6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 10584 bytes
SHA-256: 3fdcebdf5c7d42804235ddc30a51cbc9637c1a462378d6d56cd7fa75c7ad4823
font_01_sfnt_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 18408 bytes
SHA-256: ddcbd8916b7172519dd301fac83b4440bccb2b3454cda06762313827e5c3a7de
font_02_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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