Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefa1995dfa1c7f8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 08:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89e3fafeb42cfc23a0df710b6fbaf6b8 SHA-1: 0ffa1b0702c96079e580f8e44d772e356e60b724 SHA-256: aefa1995dfa1c7f8e9dfa0d00ced559b09bd46fa10a6093ce7a92610e70f4f2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The primary function appears to be redirecting users through a network of potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.nhabe.com.vn/ckfinder/userfiles/files/sekofelavatufaxugo.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97ceabba0---rebezigakuto.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/gudevetakuzem.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160746553a0d97---zoxejurifevijax.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/fabovozolega.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/5m192aqganjcfq5aa2ul6b5aqn/mikizoz.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/nitilikixeneduloteb.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/tabunil.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/60487874246.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7627d238921f839fa996f2af6eab6b5a/67243765913.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/89192386405.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/91780384119.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/sotizebusowomabe.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/kipepuxaxojolefal.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/er0fspcvl90hgm7ss2is9qd9o7/56467349423.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7m43c9t2g3glkkff6gvhaa3p4i/44586437556.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/74522899201.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/kefonotozetopovidoliwow.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/32313311307.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/7354430224.pdfIn PDF document text
    • http://ipceurope.com/assets/file/puxovomewezoniwizefukov.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/afcd45eb550f0a84697262e262f96b2a/39707320436.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c322c40363---kitedoferikulajijogise.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/newudosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kenmore+he2t+washer+repair+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://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_off0000bc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC51 10816 bytes
SHA-256: 824b7fe36d62d35d626b5e05b0857801bead6b1ca0b7a8bdf6eca6fad0a9f611
font_01_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 15228 bytes
SHA-256: bd93d6f4bcc01bc844ccf0ff637258ef999c11d07a5afa59ca589369a04de4c7

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