Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4825867a7f1f51f…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 06:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bff97b04eaa5f4889b64c3ccca8d5450 SHA-1: 6d7dc2ef8dee50780ef3b73a166b2bada9848874 SHA-256: a4825867a7f1f51f98f6bfd7579941efba0e327598c8554294212f460a7c8923
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting a phishing or redirection scheme. The embedded URLs are designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879e026924---3531730012.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9207d14947---11588288800.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/60kg8q2rith7if9bmj662tfpol/tirevorixemovaxadu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e8926f43---wubuzonafuti.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/jemeveviwum.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c73eb310---somudisuwuk.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f747c5019dd---rekelabar.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xijifuseli.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/gamovo.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/zisakoneru.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b76bcc04011---88085967971.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xixazusubozabuwefalibuwig.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/35005655004.pdfIn PDF document text
    • https://digicpictures.com/downloads/65810840027.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/27be30a94a43190b376cfe7b776a349a/9913644555.pdfIn PDF document text
    • http://gdgom.com/upload/file/210616155247739479g5kz77vrb10e.pdfIn PDF document text
    • https://etimes.mn/uploads/files/15112383906.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4150da67fed3e8b0ed0c56036f106b6a/folitivebaxajuwoleratemi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae41d4d46---xuxajixuwepemotamejikedu.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/36372149730.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/subafevimozaguluteb.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f557b9f---lisafanaxitujamazusov.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771eab4e480---dunegib.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/xusigibad.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/37982440179.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48cb262d0---vimurivirubevijejij.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/dizefaguripowemabojotuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+dress+30sPDF 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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 10208 bytes
SHA-256: d2e188d1b1a2fd4fb326c93d9426d75d36673d6cc451d6f51a4dd5ffa9435dec
font_02_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 17092 bytes
SHA-256: b166518f6f17939de65209378921bd7908829fe9465517e6e99162b40ddcbb0c