Malicious PDF — malware analysis report

Static analysis result for SHA-256 87990590772b5320…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d681f21f7057a9b8288e592be6519024 SHA-1: 2b402f3ca10f86a7a093614e30e58c1c6dbc0b56 SHA-256: 87990590772b53203fb5e199e1d17e72668817115256d98fc44af7b1aad424ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple PDF-specific heuristics indicates exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crmsaas.dswip.com/ci/userfiles/files/14650051131.pdf In PDF document text
    • http://beergolfers.com/blog/images/file/zefutefi.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/9202783755.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/77042171961.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/legixipegaforudebekule.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210818215607796189.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/6105571340.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/83282045006.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/afa8528ee09fdd0d1fdaee1f4d4e1911/rofavaxanebi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b57586b7---fetavokuzigu.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/jokoditegu.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/wodilerokozujozagim.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e34e85e441bd0aa09cfc72a766d5a48f/rilujigijifazuromiretiso.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ad216d35---nuvomamepudanene.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d8968de7---memaxosewamuvonawokor.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/efflbg8vt0f1blhsjkcdl1k29m/karafuzozupana.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/56f6a3316510d7ad3554934f7320ab63/99127596181.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8rups9pu278brkq760bjp5hfu/63907995672.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc694ffc6---xikapumuje.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a1880383---14225163289.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/10154707400.pdfIn PDF document text
    • https://landi-bg.com/images/file/33819558061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=suunto+clinometer+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/afbaa519f2a57980320b2cbdd62c3897/85545157561.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 16288 bytes
SHA-256: a7a67940fc1158ea05c9cbd3d273844863aa6605b9200ad31037916afcf2c92c
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 10628 bytes
SHA-256: 8000f0fc0a693a30253f9d59294ec227f8f8aab1c30ae352dddf0fcfa8184399
font_02_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 24888 bytes
SHA-256: 0e5a61edb5a8324ca415e52b5b9105d67f4d1d2d8692df20b2c4a3ca092b1cc9

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