Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88ea4a9979cd0d4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 23:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 13b7f9b29ff804c95f72e26338c17647 SHA-1: cd1bc90f6bbf8f0e89ca881006a921b83f576804 SHA-256: e88ea4a9979cd0d47c8848962adcc55e6c0b85d03ff6eb32dcf42d6f4c823cf0
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1394d93d10---nuwifupakeladusoj.pdf In PDF document text
    • http://charivne.info/images/file/jidozotux.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed087ca7a---futeririzufugavoxigogojam.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/39915129901.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/gopipulob.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adea35064a---vubasebowe.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/nn62s80gb3nhg4ea16f1aq360p/21882124297.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84f521e14---49486188371.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/l6uooj7bn36p4hgl7l1tntgkub/tafineninometuj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9864b5a3---nanimakox.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/64897915529.pdfIn PDF document text
    • http://dzbnf.com/upload/file///lijuwobutinipidazewakijo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4caddbcfbf3e906e1b3af5f6f84d6eef/vodiponifeputojijotovid.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb016350a1---57258503421.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090c31de8561---netodonikunotaronuximipi.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/9oipfnt75a541r5mkuep739tqb/zuxewitixaf.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/3549c50f485d6778ca07e75330dfc7ce/wigifigujanovotefet.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/paxakomijitepana.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/58398884920.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/pazunajekotafokito.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/46114566881.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c227664770a---koxobowowurolodorodazev.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/wobuzubawedigipivot.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/dugoxutorezewiv.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/wujiliken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gate+previous+year+papers+book+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/885b1503aa0c0387413f1cec5444cf38/39446700584.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_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 10892 bytes
SHA-256: cece510d70b9da96d4599a550e36e6228db73564119e0b50b4c7e14de984eebd
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 17332 bytes
SHA-256: 741e7d6a9f3789c11248bdb6e89427f977eee27b20c211d5a29af9f69f8919e7

Open this report in the interactive analyzer, or submit your own file for analysis.