Malicious PDF — malware analysis report

Static analysis result for SHA-256 91df172c293ed26c…

MALICIOUS

PDF

75.5 KB Created: 2021-07-15 22:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eaab9a9f1c4933113319b767d26f6013 SHA-1: bb613edefa860632d00dfad15de4b4e21974842d SHA-256: 91df172c293ed26cade474331e987b5655aa4e36f69a3d90e7008f4499f84c34
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4fe8d717b---47208684785.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3162bb1d060be19ddbbb2d76f78b786a/96303942609.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/49816897134.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e256ebbf839---raseposulaz.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8065ce568---gerokuxasoj.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/10n6qc6g0ahm4k40mie6j6gmf1/58282745703.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160747fa385b1d---67506697065.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/135b711ceb9cbb8dc0f654fdcaca7e7c/27401550717.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/guforogegajivulizener.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/wazukupifidefodopodediv.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/jorininaweva.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/96180534497.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5c2567a5870e82ef9d83100c6a2c5bcd/68775754206.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/gogoxigokoso.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9e8d2d96---43381467738.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/ridobuxibanove.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/lefikazirejubobebapud.pdfIn PDF document text
    • https://purefeeling8.com/data/file/93226347368.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608182782c2aa---41410448996.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/44885r2vatm35t6a23rc2229ad/35628348031.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/74c3e01d5ea06faaa71b8b663a56e079/45084451655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+first+look+at+communication+theory+griffinPDF 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_off0000c40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 17076 bytes
SHA-256: 8b13d62e3c7241c957498a4d91c26a32a96537cd33d42f7619664d1cbdac66e9
font_02_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 11072 bytes
SHA-256: 8a5313f836ff89407c399879107f66ab196be2a76abfc3cf181b38c20bb154b6

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