Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe57a6e73d9e855…

MALICIOUS

PDF

169.4 KB Created: 2021-06-24 02:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 79b2af20d00bc8d29bc75468dc132319 SHA-1: 6c38ef637272052bf91d1bc8f666c349e8c3a210 SHA-256: 8fe57a6e73d9e8550cb5115a742896cfc96db0e5f98c0318b0c52af20a4e5da1
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, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and contains metadata related to its creation, but no direct instructions or executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://sghscsjamarai.org/guruhargobind/userfiles/file/52657786940.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5c45c0217b8433f145509ef716e8aa2c/morelizugijuwivisoke.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/11a874d2f44fc75c8e744ec4d3269099/sagedife.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1a12b3b0f---kokugukubo.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0j85kq4e7pv84lqlt81k5av48/87838630680.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/duzop.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/85052534640.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kinubujavigefijujipam.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c527948c---91538830197.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff70489d6---93829282364.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffffc466ec---73675003466.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea99d2b8f8---35562214822.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/91156143927.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561376ce3e---rilanepibevanekofag.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd191e631---zupifasaxigezodepilofu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c4b801aa---46201670904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hplc+waters+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F55B 32160 bytes
SHA-256: bc07bc004b19e375730447bf4e9d956c33dc744d4a60737b05af77346851c327
font_01_sfnt_off0002591b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2591B 5132 bytes
SHA-256: d0e3da5682d654599aff2fafc8a7327ed0d1d87c2e229b920b4be954635fee2d
font_02_sfnt_off00026a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A8C 13732 bytes
SHA-256: a952d397e56e818f35f0b3125c5e65749863e1b66bf4f4c812af8d3b94e48cba

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