Malicious PDF — malware analysis report

Static analysis result for SHA-256 de20d077f75a6389…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 02:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0701332eb3a6fc6966c8632e438f2f1 SHA-1: f9ec0f7f62f4f6d6ae68b13733ec2cecc40cde32 SHA-256: de20d077f75a6389639ac1e4cd15417c3e980a0c359dc82d95d79f5d756dcc5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=albert+hourani+arabic+thought+in+the+liberal+age+pdf PDF link annotation
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/guposufofanexotisi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f605fbb693---20042342309.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6f7ae04cd1e72220579b8337629253a6/lalotilitofajaxepemez.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/wizukajuzo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1df80c5206a900d6560896a36e9d644e/21526632361.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/goxisalejet.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/fibavesalazuvaxewinum.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/zifadetuvog.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e63607064---32224633801.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609499dcdb364---tarurufex.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b353228158---64325929904.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/88155090529.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/liwefojabotedafuse.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160713c6a62b79---lujosizalonadofi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7ca22fb9---66753401406.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/fumewigogibaviz.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fa4fbced34b0377047da5eda9b5f64fe/janifekapos.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/k564e55ul7ct2ibp9bh7e3cs9h/35853289631.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd89419ee63---guvudivabodara.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/wodegovakopuxulavegawikom.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/19570c9fd4de7ab025ff427ce99042cc/xexuvorekabopo.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011b42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B42 20368 bytes
SHA-256: 4e4ae6ffc82f5d9fdf27ccb6d42740f73ec876188fbb2d6ca075a5273a9fa2cb
font_00_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 18312 bytes
SHA-256: a6d04f887a6e911ccb3b69929d4a5ff3723819b61a861efa0df1b446d80f36b0
font_02_sfnt_off00013ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 10952 bytes
SHA-256: fb44e6558f6a6171746ff3384a675e1d0596ef27b6407bfaa5907af1dee72ea9
font_03_sfnt_off00015589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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