Malicious PDF — malware analysis report

Static analysis result for SHA-256 22134289e51e09a3…

MALICIOUS

PDF

100.3 KB Created: 2021-08-02 15:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3abe2984db24567918ca060e04cd2eaf SHA-1: 02a3d5ec7c17cbda74139fba78977066e593d603 SHA-256: 22134289e51e09a369a8b9a56ee361ac2ec3e4198c1ad1443c3a8412a648afdf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple unknown URLs indicates a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868312a5b8b---vamif.pdf In PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2cd0f9612f57b167497bbbd8224d20f4/zapavifud.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c52d272b9490f04f7d9c1d956c016a5c/66469532702.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/9467321382.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a942d6b7f0a---3137855724.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/zuxanajivavorujuximugafum.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bc81bba39---riwarexezefujevejoxoxe.pdfIn PDF document text
    • http://www.polni.si/Images/files/dikevofakofivewakeritu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e384e960b50109057e2db79cf83c0cb9/xadivoxosamulam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763aa603ff8---jipoponowatalexexatazifej.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bce30678---jokufejagogox.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c413ef197---zunuwil.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/rumipebelazelexo.pdfIn PDF document text
    • http://fruitvita.com/files/files/67281202584.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/bdb0464edef4d9fa62961652ea820a12/10384101568.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59e7af4de---36495049687.pdfIn PDF document text
    • https://curvy.tw/upload/files/91282264641.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8aeb1f81c---21043374372.pdfIn PDF document text
    • https://wsbtitan.com/images/file/fogikewugowuzev.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5878c4248---54978274235.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c114f8b7e06---rufafube.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624641736866953221.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/70983a805ceb27164c99662f8ac8fe66/75231793232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+pokemon+rojo+fuego+randomlocke+gbaPDF link annotation
    • https://mega.nz/#!HB81yIYK!UiMg7oJliIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 16380 bytes
SHA-256: 677e9695f62afeefa27de66f2ae2c7cbd721294f5310bfc85fc12255cd4c105a
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 19052 bytes
SHA-256: 8243fa30c91373076e9490625bc400721c8ce4b8ab5150149353170afc3de440
font_03_sfnt_off000167e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E7 11236 bytes
SHA-256: 68e01afbd77b189a4321c55218c71fa07ca5711299929903871b581342de97e0

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