Malicious PDF — malware analysis report

Static analysis result for SHA-256 270517dfe7440485…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 08:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e75a4e9d3b8255148133c38f8700cb9e SHA-1: df20a627c9469fbb0f3862180dce4aff94d58406 SHA-256: 270517dfe7440485e4cc3bf994a91b4a2b9550c0d00053112add69a566412588
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest an attempt to direct users to external resources. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://wellnesszeewolde.nl/site/data/ws/files/rilunitedazifekufi.pdf In PDF document text
    • http://dailymaytrogiang.com/userfiles/files/97850918795.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/33608402163.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/065f4eb0dba94ff5ebd8949d1ab574d0/mitelave.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xopudatirogikaler.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/zizejadali.pdfIn PDF document text
    • https://vendax.ro/files/file/23988868123.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/mepativodajozegib.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210909_63A7622DC17CD6A9.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bc384416e5b09193b257729d024a55d1/59276351751.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/najaxofulenamurasawekaba.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613271948083f---22324939710.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/garituro.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/94463959043.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac19487d8---78192935722.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/6663278179.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/gifafipupewiwanuva.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/39551711106.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/koraxodego.pdfIn PDF document text
    • https://pratham.one/file/24878021755.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/murasupawatanikakopi.pdfIn PDF document text
    • https://primer-spb.ru/files/files/serulerutanabapa.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/sogutawoxijakozelewixub.pdfIn PDF document text
    • https://eklyps.net/images/file/rufupuxakadepuniwosidotif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+programming+mcq+with+answers+pdfPDF 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_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 11236 bytes
SHA-256: d30ec5ef659a842544d869e03aeac866bcf1ab766b357c7caa156f7838be9196
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 18572 bytes
SHA-256: ad88e628bf7c5ce1637c0efe536f6b13924715b937ea4c6168afb83db9a5649f
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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