Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23875fda9511960…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 06:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4414aa54e20c0080d7f585203ce0d1a7 SHA-1: 75aca41eea527b07aa4d4743a5e839cb1e884738 SHA-256: d23875fda951196067bf063cf09e3a0fb4ebfe86b41a487562eef066ed641b0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malicious content distribution attempt. The presence of a link farm on disposable hosting and compromised upload directories suggests an effort to obscure the final malicious destination. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=conceptual+definition+in+research+pdf PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b265e11ff93---38854939662.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8b45764de63181206abafe28b1d7657a/86865133903.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/93079681811.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/59104902253.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/61765889787.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6808ff8c2838bac665fb84ab3bed2ad4/gonejulolerewolerisoka.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609492edb1d29---sajojisuximegivipudux.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/51335090295.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fab62aef4---41630969323.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d1a81e65---93641920415.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/96601982165.pdfIn PDF document text
    • http://wenxuezj.com/images/File/70564864110.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210729_174553.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/squvqblb5s9i2im2vjg81huou7/74416293423.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/170348129271.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd2cf0143---vowujuzaxudanuzutimegaxud.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/desotesowugumu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/92843457265.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/65ad9fc77c230b304f0ce9e73c88ceb3/rabuliwiminibibaxi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/acf1a3a782fd307607fc2cd87c4f6c09/80968638748.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb89f322f70---44776191647.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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 17164 bytes
SHA-256: 5543c0219462e126342672be074fc9b902c993b1a9ebd3a436b3435a7133b946
font_02_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 10848 bytes
SHA-256: 1536aad3d971f5bb928c9d2249e72590b3331a551a5508cb7eef3fed5d2e66ff

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