Malicious PDF — malware analysis report

Static analysis result for SHA-256 29358eb5fc4037ca…

MALICIOUS

PDF

89.0 KB Created: 2021-07-15 23:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1f55e99ddb236f75a59e828bf76c2d89 SHA-1: 853f41883c4fdaaea3a0c8bdd8ecd1f7c98fcc74 SHA-256: 29358eb5fc4037ca19c6fbd502d4e9de4fb73eafee93dbb6390320f36e24c301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8587816e5382798c42ff96e6410b2c3d/sugusitawaworikira.pdf In PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/pmdtuavcroftjoe7esb0jbvt5d/vejafawanuja.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/89222388419.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e682472620---zogumuwez.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/38302162522.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fenqdg9hsgn990v173rq0rh3ec/raxigobona.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9c35cd9e9b5a9af718ce24ae3d331275/23450329165.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/68899455659.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/mejanuxu.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pixexerogefejepesobosil.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608109a158fcb---86213879967.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/72403849514.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/peliximuk.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/13974299177.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/ronokarirokavowarigosek.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6345bc790c6fb408e77340f718410b46/zarojedizifezidefezil.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7429030843---napagizadobib.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/pabexituleg.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16088775dcf4b6---fixumames.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9d39b40567044f9c74f20a883238d365/28115525379.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/tixexutukutirenuxexofar.pdfIn PDF document text
    • http://oodow.cn/upload/file/210609205352478680dorkumo7jb16.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/53484668291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=3rd+order+reaction+rate+lawPDF 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_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 10356 bytes
SHA-256: 1a9c9dcb650d05b6c71e1c65440e3c10b91ba3764f80cc02efe2934ca13414cc
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 17720 bytes
SHA-256: 1b800bd642b3c0da357dd0413f2d295b23f74130956878aaf8efe5bde02f222e
font_02_sfnt_off00013e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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