Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de5f1e5e1e7ec03…

MALICIOUS

PDF

106.4 KB Created: 2021-07-29 14:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e882a5f50801146c4e9ccec551684991 SHA-1: 81572bd05025ea2c8f6cc3c95b5336abacfef5c6 SHA-256: 0de5f1e5e1e7ec03e306819f69aa839c7b1a60d55beced12d0af4793ede3a1be
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, specifically targeting their file upload directories. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091531e9596c---fofipanafujilidemoxef.pdf In PDF document text
    • http://ladyqueen.it/userfiles/files/nulofuf.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/152583907260c5f356a63d9.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb126b308b7---88734261063.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/71128150775.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9df4cb52---zedomejanu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vruigb5tlfauppqnmg1adaak53/29707821870.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/revuvaxuretazakovi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1eb3c4532---68378809537.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zubikanonojosukupe.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1r99l9coedfh6c5cquqnrkv9vv/8832148463.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/wijanidawofasotajibesa.pdfIn PDF document text
    • http://btfa.tw/upload/files/42311865959.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a386fc54665---51239727563.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/timelodenujuvavo.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/90621244294.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/49b907c17ca6795c7595bed962836122/34322837509.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fa138c6a4e77caf4d44e3a8801671b46/kuwizumawamop.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3128e2cd8---tifekeramavabage.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c9d10e61e546f1007ae67d674d1c5cb9/kekud.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d89f96f9bb672025b459c651e994b457/kimiximikekokiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=analisis+del+cuento+el+almohadon+de+plumas+de+horacio+quirogaPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/4523445244.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_off00013789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13789 11188 bytes
SHA-256: 384ec6c2c4c1ecb0f7f924aa5dcacb9e3fba76b28d9baeea7c7e459d7d912421
font_01_sfnt_off00015104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16916 18928 bytes
SHA-256: 774bff9e1007dae7b2b92427be5873030f61d4f2faec16efe2af3a13fdf4f627

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