Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e79d81e9a5be404…

MALICIOUS

PDF

104.0 KB Created: 2021-07-26 07:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c598f47df77805273a41fed82487c712 SHA-1: e26feed4b24ab371be1ba0136859894aadd98254 SHA-256: 4e79d81e9a5be4047fb5777ce2d93f316f96c73a26b148dd06c1d4d501140cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories or appear to be on disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://terminsk.by/pics/files/suzeduzekoteraxow.pdf In PDF document text
    • https://leuphuotcamap.com/uploads/image/files/sosovebugujavudow.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160719dff1826a---63322570357.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe12f9f1288---givusewatipop.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e13f560b8---jevuzupukajivo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/fevalegusefalurelo.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/53858695353.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/96520111652.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9896306fb1b539e4fe7d546dc2421a32/75497657305.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/50583336777.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f8d69603---rufosigapisijizixezolel.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fac31f32---79208178158.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/44527789111.pdfIn PDF document text
    • http://www.centralperdana.com/file/10617439933.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/wupipezawimozimafu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1e0180d8---telot.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ac9777a6---xonenib.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m29upk91o6qpnvf85h7db17d45/rabamidevi.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/vesijimegadeveb.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/64095550808.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/31256600630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=comment+contr%C3%B4ler+un+demarreur+avec+un+multimetrePDF 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_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 19496 bytes
SHA-256: 616e81a667f64222be1c75b08210b87325097ecd5a0ef01edb31e27e9fb43d05
font_01_sfnt_off00015ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE7 10704 bytes
SHA-256: 1f07756b311059f373278dd8e781cd72985ee247c8989c3837de362b9ac01228
font_02_sfnt_off00017732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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