Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e8d05c35fb9672…

MALICIOUS

PDF

78.2 KB Created: 2021-06-23 01:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 122da2bb79c0224f73ee0be39cb9ee93 SHA-1: 12b63e7b68509c76660f988b01992cee1379ff7c SHA-256: c1e8d05c35fb967262391c6db6db328e3ef275b18883913282431a71982adc6d
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing and trojan threat. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to distribute malware or phish for credentials under the guise of providing free Tamil books. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://garglob.ru/uplcv?utm_term=download+tamil+books+pdf PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/2u45i0qdat43vkkf0daihb4rub/35119471269.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/muvex.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3acf0fb53---silejovivagu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0me4baearjkopn1v3i384ugk9h/17259591678.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092930bca46c---pejalugudikexomepewum.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501173346.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b142aeb66478a8589ea08e20a71f0e82/donidivowenijevupameloxa.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608574d1b55c4---kigojudob.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/megupixomu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4jjqcn0s8mht0lh96a4hb4ee07/53938695913.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ltabi1k2uo2av9as9q467o22k7/44951483806.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/milito.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s4klac85l69u80hpgp7oe3mrmu/musubijipojefazomuxonilak.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e82a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE82A 12544 bytes
SHA-256: 17439e7a757abbfc321280afa7394865a670c8ee24c7d3df8e66850d10b0f1dc
font_00_sfnt_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 5388 bytes
SHA-256: 67793568e928f360ce942eb145cb81bee4f2574be2adc528b12030fbbb76265b
font_02_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 10612 bytes
SHA-256: c6ece32bb2649ad2dcd7201c0aa9501931f9f70a92a2b9f3c3eb2421c7546f4a

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