Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e79addab7bf3a33…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 18:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6dc7c9788d9eca559c5403ea52294016 SHA-1: 2258f300c0d097bd45a98d2dfee04aa3f0ccaceb SHA-256: 5e79addab7bf3a33e96dc030ffce0cc25db887aaf9721295440888a61f3d865a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb059de5ec---8914025398.pdf In PDF document text
    • https://motacademy.it/file/50802452687.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0k0lbj1g8p5q5ms0o7hgbi2us1/dopupowifigoniva.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b99bd5c84---39672993590.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/71144725792.pdfIn PDF document text
    • https://norservis.com/files/files/wikazomotufubuxe.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/wolimi.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/rr5d0k6rebsgntmgpnf0i8nob2/32992791745.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b70e0e7f439---35689851353.pdfIn PDF document text
    • http://billsky.ee/files/file/71441632131.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210710061704.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d621d64e35d3dda8c39c76251cfe7d41/pezunevode.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ba2edb99---jagofo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f4k6iphfe700bssi34bsdeks10/rajaxomisumufamusiwozur.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4783f1f9c9eace5a2bb0bfe718e996e9/puzetolenuxe.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/65231966675.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/vesuzavelupi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9aa874c24da3ee8b6da06b221e76187d/10209375529.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/htcjauro3v4csiahhv3treaam9/49631245715.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/zujopukaxixas.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/38639358872.pdfIn PDF document text
    • http://ty-int.com/files/files/34886545939.pdfIn PDF document text
    • http://jinohair.com/upload/files/renamebal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=importance+of+primary+education+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_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 17288 bytes
SHA-256: b6626e16b2bd66aaf620891efd80559289884bc8391bf510ce4705d14952c3b8
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10732 bytes
SHA-256: d149d9bcb117fa1b3509920f2c3b68d5c26f2bda4b0891b8764226c3316d9f5e

Open this report in the interactive analyzer, or submit your own file for analysis.