Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bbfe91bba11f64…

MALICIOUS

PDF

74.3 KB Created: 2021-06-29 23:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16809713e92e6552b9cd9a69626cb81b SHA-1: 7922e950d6be9474ed8fafdf3d875c12e6ba241b SHA-256: 65bbfe91bba11f6428dcf7ad745c1461c5855c30aa8271c4810005e4839375c7
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering tactics, instructing the user to press Win+R or paste a command into a terminal, which is a common method to bypass macro restrictions and execute arbitrary code. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support a malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8395b080cd---63221426932.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1134bb365c---21203730790.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588002ef13---wutemubere.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zivedozifage.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0f3bddd1884ed2439891b8f18f06796f/32785161410.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/39100704972.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pivenunenavemi.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/694231525.pdfIn PDF document text
    • https://longhoang.vn/upload/files/37754691599.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcba5f9cef7---91904113613.pdfIn PDF document text
    • https://aneri12.eu/res/file/jaxeleli.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9039b00f7---66369638438.pdfIn PDF document text
    • https://emmaushuis.org/pages/49314156572.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/47372816101.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/1835831737.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1mtbcf8c5i4c6otgbju478p362/25917393129.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/644ef7bcf8b70ed52464974d0485dc81/31744924868.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/55381521502.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/sidav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b802e64115---duget.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218fd199d7---jutasom.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a04827cb4---924429708.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49f0a715d22d93e1bcc0f164f5c0c38b/49044955933.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160928af99936b---geraweba.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210625210908_horg6v.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/350eeb7e7b88f98640c87b12601046d8/bubodezopun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shortcut+to+minimize+all+windowsPDF 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_off0000c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 10956 bytes
SHA-256: f96bc9ec2a8379dddb946700efd407a48162ed3b21724fd082bac94e832412b8
font_01_sfnt_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 16228 bytes
SHA-256: a2f6faf5014a900d08041e19931a831d707fa76375a91668e0501e5c29828957
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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