Malicious PDF — malware analysis report

Static analysis result for SHA-256 4339cb6432a979c7…

MALICIOUS

PDF

87.3 KB Created: 2021-08-21 04:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dee515062dac8cb91f4afbc581c139e7 SHA-1: 015c742769e348398b79ea5b159413ce1b97fff4 SHA-256: 4339cb6432a979c76069bc59817f8d95773996cdacbb9c7e81689537bd66ceb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://marijina-romarska-pot.si/userfiles/file/gikapelo.pdf In PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/89225147576.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/toveregomulibometile.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5fc5a150d76069cfc18aa4cb9ab59c3/rapumizabovifuviliboze.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/55486178812.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/99623558536.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090248a4570e---94122142195.pdfIn PDF document text
    • http://rayanchem.com/d/files/95696218266.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f90375a83---98060077802.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/594fe8edef88efb6973b9c91f15c4b5a/zixubosixewimogigog.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607718ae4a91a---zodelivojokijafis.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a5564301---vedakifometi.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/nejaxor.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/lorajobaviran.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b661f5c155---76048997981.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/15993955640.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ea55962a4aad0d1d1a0ba78519879878/12722011594.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xisejibolapufujax.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5ab4a6bec---24546844097.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2e93diiun5lrq1c9f2kk76a810/26858777388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+to+say+during+annual+performance+reviewPDF 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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 17544 bytes
SHA-256: f3436b4733337a48a467fedd2266ef7dbd09a34d602abb5f2de6b7ec271605c3
font_01_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 11424 bytes
SHA-256: 0a325f9f485885d6f727c03af694ece8a087841250e25a9a4f3f8b2d97cc14f1
font_02_sfnt_off00013569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1