Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f436d38e0fa854a…

MALICIOUS

PDF

115.8 KB Created: 2021-09-01 04:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a47d834561c101877be3eb016abdb967 SHA-1: 1023d4cd0d87368bf5d7ac714c299fd863a4c4f2 SHA-256: 3f436d38e0fa854a1d66adbc515685e56a619e77ed062541fec87bd6f2624cd9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The presence of numerous URLs, including those on compromised CMS upload storage, suggests an attempt to distribute malicious content or phish users through a variety of deceptive links.

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 http://ahcxdq.com/uploads/file/030252071227.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba2e272f2---pijam.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7969b0f98486c8726df56d24daa6851c/98215208293.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210701063518.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/27a1b755b7a00c9ca71862acf26ae46d/77471791653.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/09/file/20210809_213623_110.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/82378044763.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/17023ced69b9c1c5c0971bc9060e272b/zivovipif.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/rozonoxilosefusikulix.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/65194834045.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/93992405643.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16118ce88e1467---49958719697.pdfIn PDF document text
    • http://iphysiology.ru/upload/nokojinuza.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160862d5602c6f---99621984493.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/75809840350.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/85800404173.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ouh8pta3n1dbjktgv5ke12399e/27119524812.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c53343b3b61---rilevedojajimanetadenemi.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/38085633153.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gqcjt2var0rcr2vn479oivho2c/45572453526.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856cf6ed0b6---nexozeja.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44878e0f90---93995092484.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/48839841475.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1cfc5b34f---6028184166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=eve+jump+freighter+guidePDF 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_off00015d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001754e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1754E 10624 bytes
SHA-256: 4861108e9087f9f32ea2a0e823bc97d10dd9deda6f2b49ecfa66939538562ed8
font_02_sfnt_off00018d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D4E 19932 bytes
SHA-256: a290ec857b86852b3031b855c8bde98e3aefcc55a7a6fe49c0142b1935f8f6da

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