Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2dda0a176d20d02…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 22:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 644a0224e7890ac6d85ddbf902e0eaeb SHA-1: 1a5acf158e5579fae733dfacbd51f28bdf280a7b SHA-256: d2dda0a176d20d0299bcece20d7da77ca18c5af5472d866a9f5bb21c9b2f6aec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating PDF links to algorithmically-generated URLs and compromised CMS upload storage. The PDF contains a link farm with numerous URLs, many hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and heuristics point to a malicious PDF designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/sekafiraguketijisos.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887fec3263---wilipajegukufe.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/tofipevetiru.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/21865390396.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/71816136598.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xafen.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/2719669101.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/76273775047.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///88617612231.pdfIn PDF document text
    • https://stopserv.ru/files/file/difuguzegepobefi.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/71409649168.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/93448853486.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dafitu.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/jaxesaded.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/29ae4241d87640842f9f6accbbabd7de/89029838267.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/43916245128.pdfIn PDF document text
    • https://preciseenergygroup.com/media/85800539297.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/razopedeku.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/68916127193.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/31ae4e10355116cc3d248827a7e7089c/86301531898.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/78656444207.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11819874114.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6bfdea0455814337774ece05f6d52c42/32632456297.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/12547034574.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/rewofibaletap.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/rupanapobuwubumopufesaxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fast+and+furious+tokyo+drift+full+movie+putlockerPDF 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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 18324 bytes
SHA-256: 8676a64063af6ff463c604196464cedb4609a305210fb5913e9a2ac7dcfaa5d5
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 11128 bytes
SHA-256: cb55b3c21617a5d88855f0acbb54e3a371e31bc362d44a05def746d645312616

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