Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd99068c5433d2cb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 11:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 29179026cc3b021da116f74bcaa6b05b SHA-1: 172f0fe16b661e50bb4518c137b9ea1714c7903c SHA-256: cd99068c5433d2cb761e538653911f94d424bc2e4cefa4677b0af877d6dcd628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=temblor+libro+pdf PDF link annotation
    • http://rjbmachinery.com/d/files/kazoxuvezazopewegajax.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/kojogabubivej.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/37314248191.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/82058851309.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/11524577268.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4c373edf---67146750132.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/zuzasozanogovini.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/47092472195.pdfIn PDF document text
    • https://migger.dk/userimages/file/guxujaziwegasokibixak.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109120151092920.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/budetewuzinonebobibu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/bivusoxisozusazixavikowev.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/bodapaxawaxusetefada.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/689df9c2efec201d990ad88460995dc6/xigekuwexuzof.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/42560190744.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/21243474212.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/7290953145.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396dc060e2---viguto.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/8376165900.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/e639eb315a17231bfef188572829b9dd/98575540015.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/lebutixizunij.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/besonugilenugapovizo.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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 19644 bytes
SHA-256: 25f9c003adc1bbfb81bd63a865386d4b427541ced2dfaee7cf967a17d591c9e6
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 10228 bytes
SHA-256: 588138c862eb6281b9f1c0042df2c8b562e5c63426865cdc551631addb75a703