Malicious PDF — malware analysis report

Static analysis result for SHA-256 2037b07d51265526…

MALICIOUS

PDF

100.7 KB Created: 2021-06-25 22:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c52988a185fc70f704e39379cc361c5e SHA-1: 5e8799da0ba546aaa6a75ced67f47882f34ff098 SHA-256: 2037b07d512655260af664e3758a4f412e479303a2ef9076b3a0ce9d925d7ab5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous external links strongly suggests a redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9725bc9f3---kutoguw.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/80a69db7a5bd0360db46cfc7f152b2ce/80979672280.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/basazesibamarigemovago.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/4sk4e5c7tm31i73cfsfhvolot8/68860546387.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc75b6c50---femesole.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc692cd16a584231b28958af06fd406e/63525474022.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/putita.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d291b6223---xudutadalu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/684fi9qe7k9f7fmlfau2rftqm2/farosulejerotobimawapa.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/cr6si1nc8kitcdis6858rhnpf6/rosixidomegimuwuzafak.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/sosobonux.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6f9c2eb92---luxafiwogotebaz.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/81103799484.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zovizupinosevizad.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/dca002d7b4cdd7cca711f58efeeca06d/siledegafo.pdfIn PDF document text
    • https://beliangka.com/contents//files/59336205628.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/96580620983.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/76435532848.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e5188b94---11347357248.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c71ceda32---32940018924.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fipuwutofufajujugamidap.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f256f0ccae3d8ff93c6c5516497f9f14/99373994048.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vuzonusoneramagiwovu.pdfIn PDF document text
    • http://imi.vc/upload/files/bazanomivegubumezavud.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e3de45b742fa32e18578598ec5438ad5/xalarosesadomumagiwoxa.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/80463463905.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/af7248a4cbef664f52a82c0c302da769/pagopotajaxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+master+the+radial+arm+saw+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_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 10736 bytes
SHA-256: 0f4d3aa28d59bfddc0e7698cadfdf2aa3d83d0d6368ea90accff0759c9e708a4
font_01_sfnt_off00013d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7D 18008 bytes
SHA-256: 9b1087702d3023b00131a146a810c51a9f9788bf01f55d67737e9a33e481b345
font_02_sfnt_off00016d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1