Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b03bb21f9ef30e0…

MALICIOUS

PDF

81.5 KB Created: 2021-07-04 20:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a1babc01dbdc0573e1cb799bc92de98 SHA-1: 58b223a895d53e17d1fee3f47a3a7eb75cfef40f SHA-256: 7b03bb21f9ef30e0ed3bc1fa4b054768e6c7404b8d17fd16ae05fe07fd18ff18
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users into phishing or malware downloads. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=if+you+clap+your+hands PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/fb7f5f27c927f53b895119ec038011c9/dugokufoben.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/msn4h1c7b29kbbctk3li555af2/movigasibagiled.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/japabetavug.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xofiwipivafebazo.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106171914.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kusitesamokajubijabesamen.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749bcd73d68---tonuzunenup.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/dofufi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/givexoxan.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b421c8855507ba1952b689c1aba73651/rakak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4be34f587---66124013509.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160724c2785893---51655420102.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-18/20210618121644493831.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/395b2751e2e16302064999f0ca0aeda8/gedogofetidebutat.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/88836771ed06fd8beb2b7d0c7cb75c64/8084568512.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97bdbc991---zafesilomoxiwoji.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/24425026979.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df1b49c6da---49883446729.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607437085a86a---44238008443.pdfIn PDF document text
    • http://novichiha.ru/pic/file/59987555807.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/97414142448.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 17400 bytes
SHA-256: 7f46d8bee2c4823cb60bc10253c12be173a9a83a5417305ab76b0f3f72b450ce
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 10560 bytes
SHA-256: ff08986c01465fa44797e87a646ce3809305eccc6feb88f7591ac016902ae727

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