Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e884777990eec9…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 20:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbb2c46f6a58f67c4ddf725f71ba5731 SHA-1: eee0d3a9ae79853624a07fdc5b96b23377f1d0f8 SHA-256: 71e884777990eec9563d1a0821057d2d5ee7967d10ae00e99ceeab9177de8417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bestrecycledautoparts.net/images_i/file/gitisigidinipin.pdf In PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/36931260796.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/54962126389.pdfIn PDF document text
    • https://ultralloy.net/upload/files/80720506854.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/11999840001.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612443b02312b---fajejixotol.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/gewitagowezuworo.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/46839533901.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/36479492426.pdfIn PDF document text
    • https://alutat.com/data/file/vidonunixanem.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/fokosazosi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/19146787283.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/1962695974.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/271ab82d23a358a77e5f11b16c55c23e/lutanomowotuxegobevad.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/40056117821.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/68610081124.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/fidavepijuburolibi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/h61hqbgcd3hvgj9s8132g2pq77/moduverip.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/78562425963.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/2242005760.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/21618454309.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77da2f9eb---suzovusozovizojemuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=peripheral+neuropathy+symptoms+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_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 17452 bytes
SHA-256: ba66291e45cfa2f2d849b94c241709f2a30fe76ea33a582e49a80d69ddfa8db3
font_02_sfnt_off000138c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 10976 bytes
SHA-256: ce0974a0223632409d607f88e842a2f8123da4668330a2588405ede7f8e44348