Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7f13d521a00e34…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e32c9705aacf44972aeb43f61b4e55ba SHA-1: 756d67e824c57f6e6675f547900dd61e08e621e7 SHA-256: 0c7f13d521a00e34e4fd522717d34dbc7feb71ba195a5f5517fcd1c048339077
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=list+of+all+protocols+and+port+numbers+pdf PDF link annotation
    • http://romanakladatelstvi.cz/userfiles/file/rododonapetekibowatarob.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/93005507554.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161199129bfde2---54492910688.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/junobagazamupet.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/gufogemunonokeko.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0609e7b2---387944250.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c95ec8a21b---sopotosopuso.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/dokagi.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/53011420951.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/85874277943.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c8622e4ec---xarubefajuxitizugekefu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16126f56b91d13---fibarebo.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/zepak.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/33468780385.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/meboguxopas.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9f3a55e7543415f8e3f72d4e95891114/xemavaw.pdfIn PDF document text
    • http://boxethai38.com/upload/file/6631291157.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/xalewep.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/15113659519.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145a811ff6---fagaroviwuresusuzok.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609129fc209de---xararidusulizilimifedaved.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/34273231872.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/novubekovukemeruli.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_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 10976 bytes
SHA-256: 3f77a8b626b23e3e67eef052f376f8f90a06ca42a229e2a16488dcd124fe5734
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 15776 bytes
SHA-256: dd800ac7c8ab0a77062fdcb340c2b8fb4956b4a8d87f7c34bbdc738499085318

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