Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e55d99893fc0b2…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 00:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 726504e119d9d25c9f3fa42c6b2aff78 SHA-1: 61965333e5e1cbb4f11aac46d1c7c154c176a420 SHA-256: f3e55d99893fc0b2cce4a689ed648e8f00a70e8e39e2d5c1b1c92aa13380d48b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://sunarchegypt.com/userfiles/file/rirefoxiranodapikuxoz.pdf In PDF document text
    • http://boek.se/bilder_umeny/File/45015290456.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/git1t5em7nj1c9uo5r3bp8n67a/47573127321.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/dowojerebaged.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/19847392666.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/64944cf6462ee053bf425c8a35693d7d/xerib.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/gesuzikiva.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210625090602.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a0710b08e96---fozomikumatumowek.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b0bb4999---sejupowadaporewerig.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/67835577980.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8954t6a8vf2bsh4g80t1hlbu1m/63786395725.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc169b1b7---xokesijifatiweve.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7102042ef---946453453.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24613a1ddd---jibigosununowuzutasij.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160714d99d4419---gamamuj.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/fodoteroxefebivovewozisi.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/42586608429.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wetatanaguzimerolenasagu.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/lebojid.pdfIn PDF document text
    • http://rsst77.ru/upload/files/tepibaxebolodipefina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=do+you+remember+september+earth+wind+and+fire+lyricsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 18268 bytes
SHA-256: 177c4a462ac040df2b487d6d2626737f202a81ae7a4cd206b87c83c6605af515
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 11328 bytes
SHA-256: 19e6df76e8c7592f7271c7eeb570a0f9efeee13ac83f1e98010994b57c391d95
font_03_sfnt_off00013a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 16524 bytes
SHA-256: 088624e29e31242ce954ff1fed4ad13aa10d9b06bd6fe848848d77269e34e262

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