Malicious PDF — malware analysis report

Static analysis result for SHA-256 851487e07f7f38db…

MALICIOUS

PDF

94.6 KB Created: 2021-06-14 23:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f654472567ddfe002c90b39207718abb SHA-1: 445409f2e0c66a5a0e7c5a90f751aca1444f0527 SHA-256: 851487e07f7f38dbcc390b28bcda9c9ff55237b26642808b95ec10d6706145be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/uplcv?utm_term=elite+of+the+classroom+light+novel PDF link annotation
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ea71b0595dac1e9efdd5a99ce4df33f5/bipatuvesuninevujad.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/pididoridodon.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/91b6d016115699d9d3c6579dd6ed998c/lixoweribinitez.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l75iqia23ie9ihq7cje6jbrfcn/31746455850.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160764a6bab649---379446865.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11da806197---jugekuwetu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3747e3dfe6---34919164606.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/37053212598.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/529ca1413cd94f7946fbe1cf2cc83a66/41186455603.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/41eaaad264dfda9266a4ea309110c94d/38391152612.pdfIn PDF document text
    • http://nfc.soo.jp/file/58103681410.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fifodevijitegukud.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1dgapq1uv7hn3vbjrj065sgrq4/ditekidizaf.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/wazipovesuxululuzasipos.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/djl2mm2nva8k472bluhvm58c05/37097450592.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/41770843317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 5892 bytes
SHA-256: d7dc3b4c51c8d85450c96f6420006c1e886409bc1b2d4e47ae60a16b14ccc421
font_01_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 5100 bytes
SHA-256: 29102d676d736f7d0667bdfaca9a811cb87ed1c8208ef366cba60eec0ceaaf4f
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 20996 bytes
SHA-256: fbd690396bc5ad62fe5eaf0c8e11bd1fc868d568bb3c182ea440bf477e2f9966
font_03_sfnt_off00015f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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