Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5e246ec27a8cea…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 12:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c269f7ca2bbf931fc222a3e4bbe95dfa SHA-1: 0d3c3a6fec0fd63cb1820bbed72b437102ad8842 SHA-256: 0d5e246ec27a8cea17d9581904aacf29f911243ec6cc00a0f42bd4db488c87ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites. These links likely serve as lures for phishing or to distribute further malware, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/134ec51803a9f6cc6cb54f2afdd7a0ec/moxeziwunima.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bc3a43222---jiraparufifane.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07a4040ab---kefuziz.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/66968551734.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512164753341519.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nihdm139ol34a3bua2bn05ut5d/zosekuwinidekevavexik.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/21600632771.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/pejenit.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c322cdb13b0---71517620634.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/448e358598ffb967402d85059c222d86/kimirizulejenifut.pdfIn PDF document text
    • http://simonide.org/userfiles/file/pedenepikidewuso.pdfIn PDF document text
    • http://bjjiffy.com/upload/ranuwugopinuvujonekiko.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd71ab0ed---vanovenifejebigaf.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/rejivaniwak.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8949831343.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062803465973499.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a706acd0e1e---86064415792.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/97660916870.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7039d9a17808a8f3829cdff746ca72ea/megixedavesotute.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/zumezagadexis.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/80730482323.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/dafikazativanu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/zedujexotukepebaz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/76356438423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=c+tutorial+for+beginnersPDF 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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 10660 bytes
SHA-256: ed7a7f265dccfa8ef569ba8845cd9ba9cd7c75718669fe506c5111b8174e627f
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 17336 bytes
SHA-256: ccf4a3c1db228a1d59e3634f8495612700f80a14764bd5cda3f7c39bed7fce6e
font_02_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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