Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91c239cf793acfa…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 11:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c1c5ca24ba103414f9090d3904996f5 SHA-1: d3466341622021dc8adcb7aa3f12bea02634f983 SHA-256: c91c239cf793acfae92fa712975a7a64915b9b83ad45ada7db78e9a1f6f74575
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a fake invoice lure, designed to prompt users to click on embedded links. Many of these links point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=gst+invoice+sample+pdf PDF link annotation
    • https://chrmglobal.com/userfiles/file/vawutofo.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/kufidaduvanividabinoporut.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/an2lpqqhs52aggs1t3l46n41m1/sabulivebupedoresakutij.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c637b0d9728b6a3d654bccfa7ea67dc9/baxafurutagitotadigugubi.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-5/20210805022902548741.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/27a4ada5d5843a17924ecf0a99c69f85/38905153472.pdfIn PDF document text
    • http://jonme.net/ckupload/files/kexakutawogive.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4c3cdea437142ed6aff505aa5ac7eb65/23937944692.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eeb8312d---73188766463.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/bixibemobuwe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1279dfac1.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vdo04t7acq22t8ri12eov2kta2/38505221749.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/9963750001.pdfIn PDF document text
    • http://93564497.com/userfiles/21756655825.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/28210139815.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/wujazodimavaviwuxawozu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7eeab8b0d---68483229467.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5f3f010f---5275454846.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/80f1197d4dd0997eae043416b1a7cf3f/98458614192.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/08a5062a7ee5590df17eb5a6f8b037a1/17809601477.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d34445f6813ea35e891557b17e9e7344/zozirapus.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/74062329766.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c581c809c82332b0c554ed03fae13019/51348240694.pdfIn PDF document text
    • 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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10784 bytes
SHA-256: 831b8add111f2b9fac8a996015bc9c1300f9e310efa383760f2257dd73835b4e
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 18480 bytes
SHA-256: e1e88d8c2913eebcd26b882c4a20573229898dd36176d2857772b25f5271b153
font_02_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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