Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90db3216d960958…

MALICIOUS

PDF

120.5 KB Created: 2021-07-06 11:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8befc883595041fbe4c379bc7b99bdb1 SHA-1: 012bd1cb60f1262645a714eb195cfb738a9df536 SHA-256: d90db3216d960958613f9c99076674ce710d5aee0cc9814607d22b77f90c7df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://aradmissions.com/ci/userfiles/files/zirenurogositanedikefobo.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a33ee446750eec099566beca1b4bd37b/dukidivadebu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160744608aff85---kibubofowow.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5a408962b---malerudefelopegoxub.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/nizokewizamowenebure.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8eb6cd5a7c74239b9f873298622299c7/78887550880.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/67e9c2447c4b5c9040e6dc582457df5c/75903342124.pdfIn PDF document text
    • http://airfa.it/userfiles/file/likisilaxapoxo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49223ab90---karebupizu.pdfIn PDF document text
    • http://allycatering.com/userfiles/wiroje.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/nodilivarapanamigu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4107c06ff---jizozopiwaduzedamozet.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fd8ef950---80819075756.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd5730377---15834598025.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e1e4e615---8871167433.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/92523974685.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b2d998c9---jurilevaxejobum.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d98e1250f2---zinewugaziwofelorapafeb.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/7258119992.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2942091cc0---lafiroraganexojom.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ac37293c80c7845c275fd162340c1d0d/wotidoxet.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160770f4c9d5d2---jewudoj.pdfIn PDF document text
    • http://markone-tools.com/upload/files/17592800228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=reverse+pages+in+pdf+onlinePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d7d9ddec---kevafawebapibaxilipugepa.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_off00017737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17737 17180 bytes
SHA-256: 4abd12d09282609bd303e8314aaddd2fc6eafcad5208696279985a434b0ad574
font_01_sfnt_off0001a46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A46C 10688 bytes
SHA-256: e85fec1a29a06f8bfbf64d09bb19564253e28b56ae84c8ff1275d7d7f539771e
font_02_sfnt_off0001bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1