Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a462d90bc5465c8…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 22:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c9030078770c6bf30f54d210b6ff4791 SHA-1: b2248cfd253778adfbe3f156f9fc9c005a79f03f SHA-256: 5a462d90bc5465c80893268523123e0776320acd69a97fb631a884e7f46f142d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The presence of numerous embedded URLs and the nature of the detected heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e49d41088b1095a7193e099587020fe3/rifufetirexerepetoseku.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/sadanokejewidaregamo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cc5f307f85ae0c6cb074391976f8e5bc/fipikuzizajosidumamemabe.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/63427589651.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/rijumo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a09a1f8f---seluziko.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a21d1c3d5cc---89483744148.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/agsa7k57i43i6ecvp8b0s6071h/paxuferuxalefodubeji.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/49d89c359304e5ccb11af88d3e0f9561/pazej.pdfIn PDF document text
    • http://accronline.com/userfiles/file/66660576009.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/829ad1c23112131dbb5ff00152086ef6/80674410507.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/34458879152.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rmn96vrghss73sgje9bo146p59/84762323891.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daff66cf96---buzagokilufal.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/23816193715.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/70357074420.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff79f3a556---jojumorawiwuvinu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ef2683cddbd8af5061f3d10d41172a59/joxonifoxozazedudob.pdfIn PDF document text
    • https://tappowine.com/file/27704195124.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/78002439f787ec1eadc6ef711113268f/xegure.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986900eb8f8---suparesevazoxipivopodufeg.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/117a8402b65f952fff15e2998566ae02/nowogijojigewewinavidaxig.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8fd018d6783135e49c23b66f3259cc62/16048165916.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/usi6jo1j6iaec5j1fuocgenfq2/ligutotaronozabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+into+my+phone+if+i+forgot+the+patternPDF 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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 18420 bytes
SHA-256: 7b49b3013fab59bce073a8fc683f5fe1741e947ba86918ee1144daa2bda05b40
font_01_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 10780 bytes
SHA-256: e6ab75be622575db65770fa5d5074748d7233539a97015c46caba6f24c65820d

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